3M
™
VHB
™
Structural Glazing Tape
2007
Technical G
uide
pg_0002
Table of Contents
Introduction…………………………………………………………… 3
Technical Support Center…..……………………………..………… 3
Product Portfolio.………………………………………………...…… 3
3M
™
VHB
™
Structural Glazing Tapes...………………………….…. 3-4
Adhesion Promoters………………………………………….....…... 4
Abrasion Materials…………………………………………..........… 4
Introduction and Background…………………………..…………… 5
3M
™
VHB
™
Structural Glazing Tape Properties and Performance….. 5
Composition……………………………………………........……… 5
Durability…………………………………………………........…… 5
Moisture and Solvent Resistance…………………………........…… 6
Structural Performance Tests………………………………..........…. 6-7
Structural Glazing with 3M
™
VHB
™
Structural Glazing Tape …….. 8
Introduction……………………………………………………..…... 8
Structural Joint Design……………………………………………… 8
Design Considerations - Adhesion………………………………..… 8
Design Considerations - Tape Width (Dynamic Loads)…………..… 8-9
Design Considerations - Tape Width (Static Loads)……………...… 9-10
Design Considerations - Differential Movement…… ……………… 10
Materials Involved in Glazing - Glass……………………….........… 10
Materials Involved in Glazing - Metal Frames..…………….....…… 11
Project Review and Warranty Obtainment………………………..… 11-12
Additional Testing Requirements…………………………………… 12
Application Procedure for 3M
™
VHB
™
Structural Glazing Tape ….. 12
Factory Glazing…………….……………………………………..… 12
Site Glazing……………………………………………………..….. 12
Application Techniques…………………………………………….. 12
The Work Environment…………………………………………….. 13
The Workbench …………………………………………….............. 13
Surface Preparation…………………………………………….....… 13
Surface Preparation of Glass…………………………………...…… 13-14
Surface Preparation of Metal Frames…………………...................… 14-15
3M
™
VHB
™
Structural Glazing Tape Application…………............… 15-19
Weather Sealant Application………………………………….......… 19-20
Bond Build Rate……………………………………………….....… 20
Sloped Glazing……………………………………………………….… 20
Protective Glazing…………………………………………………...… 20
Glass Replacement and Remedial Glazing…………………….......… 20-21
Quality Assurance and Warranty Documentation..……………...….. 22
3M
™
VHB
™
Structural Glazing Tape Project Checklist…………....… 23
3M
™
VHB
™
Structural Glazing Tape Application
Warranty Request Form……………………………………......…… 25
Global 3M Contact Information for 3M
™
VHB
™
Structural Glazing Tape….…………..……………………………..… 27
2
3M
™
VHB
™
S
tructural
GlazingTape
TECHNICAL GUIDE
pg_0003
Introduction
This technical guide is intended to give guidance on the
proper fabrication methods used in the assembly of a 3M
™
VHB
™
Tape structurally glazed curtain wall system. Also
included are the procedures associated with a proper quality
assurance and warranty program. This guide should be
considered as a reference document only and should not be
considered as a comprehensive process guide or quality
assurance program for all applications due to the variability
of design and performance requirements associated with
different applications. Therefore, it is recommended that the
customer contact a 3M Sales Representative or the 3M
Technical Support Center when considering the 3M
™
VHB
™
Structural Glazing Tape process for a structural glazing
application.
Technical Support Center
All 3M
™
VHB
™
Structural Glazing Tape projects require
a thorough application assessment by the 3M Technical
Support Center prior to the initiation of each project.
3M requires the customer to work with a 3M Sales
Representative and a Technical Service Representative to
initiate a 3M
™
VHB
™
Tape structural glazing application.
Each project must be reviewed and approved by 3M before
the 3M
™
VHB
™
Structural Glazing Tape can be used on a
project. Use the appropriate regional telephone number listed
below to initiate the 3M
™
VHB
™
Structural Glazing Tape
process. Be sure to ask for 3M
™
VHB
™
Structural Glazing
Tape Sales, Technical or Marketing support.
United States:
Technical Service – Steve Austin 651-736-1259
Marketing – Mark Jennings 651-736-6076
Or for your local 3M Sales Representative – 1-800-362-3550
For a global 3M contact list please see page 27.
3
Product Portfolio
3M
™
VHB
™
Structural Glazing Tape G23F
3M
™
VHB
™
Structural Glazing Tape G23F is a gray closed
cell, double sided acrylic foam tape that has the capability to
develop very high bond strength and excellent long term
holding power when bonded to glass and metal framework.
It was developed to replace silicone structural sealants in
structurally glazed curtain wall systems.
Construction:
Adhesive: Multi-Purpose Acrylic – 2 sided
Adhesive Carrier: Conformable Acrylic Foam (closed cell)
Thickness: 0.090 in. (2.3 mm)
Density: 42 lb./ft
3
(673 kg/m
3
)
Liner: Red polyethylene film
Tape Color: Gray
Performance Properties: Note: The following technical
information and data should be considered representative or
typical only and should not be used for specification purposes.
1. Peel Adhesion: 25 lb./in width (440 N/100 mm)
(stainless steel, ASTM D 3330)
2. Normal Tensile: 70 lb./in
2
(480 kPa)
(aluminum T-block, ASTM D 897)
3. Dynamic Overlap Shear: 65 lb./in
2
(450 kPa)
(stainless steel, ASTM D 1002)
3M
™
VHB
™
Structural Glazing Tape B23F
3M
™
VHB
™
Structural Glazing Tape B23F is a black closed cell,
double sided acrylic foam tape developed to replace silicone
structural sealants in structurally glazed curtain wall systems.
Construction:
Adhesive: Multi-Purpose Acrylic - 2 sided
Adhesive Carrier: Conformable Acrylic Foam (closed cell)
Thickness: 0.090 in. (2.3 mm)
Density: 45 lb./ft
3
(720 kg/m
3
)
Liner: Red polyethylene film
Tape Color: Black
Performance Properties: Comparable to the typical results
for the 3M
™
VHB
™
Tape G23F. This technical information and
data should be considered representative or typical only and
should not be used for specification purposes.
1. Peel Adhesion: 25 lb./in width (440 N/100 mm)
(stainless steel, ASTM D 3330)
2. Normal Tensile: 70 lb./in
2
(480 kPa)
(aluminum T-block, ASTM D 897)
3. Dynamic Overlap Shear: 65 lb./in
2
(450 kPa)
(stainless steel, ASTM D 1002)
3M
™
VHB
™
Structural Glazing Tape Technical Guide
pg_0004
Adhesion Promoters
Silane Coupling Agents –
3M
™
Silane Glass Treatment AP115
Silane coupling agents are required when bonding 3M
™
VHB
™
Structural Glazing Tape to a bare glass surface. Glass is known
to be a hydrophilic (water loving) surface and this characteristic
makes the acrylic adhesive bond susceptible to change under
high humidity conditions or when exposed to moisture. Simple
surface treatment with a silane coupling agent diluted in a
mixture of alcohol and water can help to reduce the “water
loving" nature of the glass and enhance the tape bond in high
moisture environments. 3M has tested silane coupling agents
and has found 3-Glycidoxypropyl trimethoxysilane resin (Dow
Corning Z-6040 Silane) to provide the best performance for this
application. This silane coupling agent is available premixed
and ready to use in various quantities from 3M.
3M
™
Primer 94
3M
™
Primer 94 is a one-part solvent based primer. It can be used
to promote adhesion of 3M
™
VHB
™
Structural Glazing Tape to
metal frames especially when the frame has been overcoated
with paint. This primer may also be required on glass when a
reflective coating is present on the interior side of a glass panel.
A 3M Technical Service Representative will help you determine if
a primer is needed to achieve high bond strength of the tape to a
metal frame or reflective coated glass.
3M
™
Adhesion Promoter 111
3M
™
Adhesion Promoter 111 (AP 111) is an isopropyl
alcohol based solution used to promote adhesion of 3M
™
VHB
™
Structural Glazing Tapes to metal frames especially when the
frame has been overcoated with PVDF based paints. A 3M
Technical Service Representative will help you determine if a
primer is needed to achieve high bond strength of the tape
to a metal frame
4
3M
™
VHB
™
Structural Glazing Tape 4972
(Brazil)
3M
™
VHB
™
Structural Glazing Tape 4972 is used exclusively in
Brazil and other parts of South America for structural glazing.
This product is very similar to the 3M
™
VHB
™
Structural
Glazing Tape G23F with the primary difference being thickness
of the acrylic foam tape. This tape has been successfully used
for this application in South America since 1990 which demon-
strates the capability and long term durability of 3M
™
VHB
™
Structural Glazing Tape for this application.
Construction:
Adhesive: Multi-Purpose Acrylic - 2 sided
Adhesive Carrier: Conformable Acrylic Foam (closed cell)
Thickness: 0.080 in. (2.0 mm)
Density: 45 lb./ft
3
(720 kg/m
3
)
Liner: Green polyethylene film
Tape Color: Gray
Performance Properties: Comparable to the typical results
for the 3M
™
VHB
™
Structural Glazing Tape G23F listed.
This technical information and data should be considered
representative or typical only and should not be used for
specification purposes.
Abrasion Pads
Scotch-Brite
™
General Purpose
Hand Pad 7447
These abrasive pads may be used to lightly abrade the metal
frame bonding surface to increase bond strength of the tape to
the metal frame. They are available in maroon or green colors
and can be used by hand or attached to a power palm sander.
Testing by a 3M Technical Service Representative will determine
if abrasion is required to achieve high bond strength to a specific
metal frame finish.
pg_0005
5
Introduction and Background
3M
™
VHB
™
Structural Glazing Tape is a high performance
bonding material used to attach glass to structural glazing
frames replacing commonly used mechanical fasteners, gaskets
or structural silicone sealants. 3M
™
VHB
™
Acrylic Foam Tapes
have been demonstrated to be very capable bonding products
since 1980, providing an often ideal combination of
performance, durability, and ease of use. They have been
successfully used in a wide variety of demanding industrial
applications in areas such as commercial building construction
and transportation markets. More specifically, they have been
used in thousands of international applications as the main
bonding agent for structural glazing of glass curtain walls since
1990. This along with independent, third party test results
demonstrates the capability of 3M
™
VHB
™
Structural Glazing
Tape for this application.
Conventional methods of bonding the structural glazing glass
panels to a metal frame employ either single part or two part
silicone structural sealants. In this system, a double-sided open
cell foam tape (spacer tape) is typically used to give temporary
holding of the glass and for creating the necessary open space
for the structural sealant. The dimension of the spacer tape is
decided based on the desired sealant bite and bead thickness.
The bond should not be disturbed during the curing of silicone
sealant, and it may take days to weeks to achieve handling
strength. 3M
™
VHB
™
Structural Glazing Tape provides an
alternative bonding method that can provide the performance
needed for the application, yet with some significant benefits.
Potential advantages include:
• Faster assembly
• Lower total cost
• Low mess and less waste
• Immediate handling strength – no long cure time
• Reduced space requirements – no storage of curing units
• Improved aesthetics – no color mismatch between
structural silicone and spacer tape/gasket. Also, no
voids or streaks as in structural silicone.
• Consistent bond line thickness and width – precise
delivery of bonding agent
• 100% nondestructive, in process testing capability – test
all panels
3M
™
VHB
™
Structural Glazing Tape replaces both spacer tape
and structural sealant and there is no curing reaction involved
in bond strength development.
3M
™
VHB
™
Structural Glazing Tape
Properties and Performance
Structural glazing requires joining systems that meet the
highest requirements for adhesive and cohesive strength,
weathering resistance and durability. In addition to the
performance, the long-term durability of 3M
™
VHB
™
Structural
Glazing Tape is also critical for these applications. The typical
physical properties and performance characteristics such as
normal tensile strength, dynamic and static shear strength etc.
are well known resulting in the establishment of simple, useful,
and conservative design guidelines for tape performance that
can be used in design calculations. These design criteria
provide sufficient performance for this application, while
incorporating safety factors typical of the industry.
Composition
3M has been a technological leader in acrylate pressure
sensitive adhesive (PSA) technology for over 40 years. 3M
™
Acrylic Foam Tapes and Adhesive Transfer Tapes represent
examples of 3M’s proprietary state-of-the-art durable
chemistry. The long-term aging resistance lies in the polymer
comprising these tapes. The chemical bonds that make up
the polymer chains consist of carbon-carbon single bonds that
are highly resistant to energy in the form of heat or ultraviolet
light, as well as chemical attack. In less durable foams or
adhesives, such conditions could lead to cleaving of the
polymer backbone and thus a weakening of mechanical
properties. In the case of acrylic adhesives and foams, however,
additional crosslinking is chemically favored over chain
scission (cleavage). This means that, rather than undergoing
a process of decomposition, the acrylate materials will tend
to build modulus very slightly over extended exposures. This
translates to a stronger, long lasting bond.
Durability
The ability of acrylic adhesives to withstand cold and hot
temperatures, UV light exposure, humidity, and other
environmental conditions has been documented through both
real-life and accelerated aging studies. Accelerated aging tests
are conducted by subjecting bonded samples to cycling heat,
humidity and xenon arc UV lamp exposure, and measuring the
dynamic tensile, shear and peel strength values. These tests
demonstrate the bond strength does not deteriorate below its
original performance level, even after exposure of 10,000 hours
in these extreme weather-o-meter tests.
Real life aging studies take considerably longer to conduct
and one must wait for years to learn the behavior of the tape
when subjected to weathering conditions, but the results also
demonstrate the long-term performance of 3M
™
VHB
™
Tapes.
These tests typically demonstrate about 100% bond strength
retention in 3M
™
VHB
™
Tapes after 2 to 5 year aging cycles in
the hot, humid climate of Florida, the hot, dry and very sunny
climate of Arizona and the cold to hot extremes of Minnesota.
The tests are done on bonds to aluminum, glass, stainless steel,
PVC and painted metal. Similar results have also been
observed in an 11-year outdoor test conducted in Japan.
pg_0006
Moisture and Solvent Resistance
Water can hydrolyze not only the chemical bonds of every
polymer backbone but also the bonding of an adhesive to the
substrate's surface. This phenomenon may appear even at room
temperature and may cause both cohesive and adhesive failure.
Adhesion tests have been performed on 3M
™
VHB
™
Tape
bonds of aluminum to aluminum that were subjected to over 10
years of submersion in 5% salt water and ordinary tap water.
After testing, bright clean aluminum surfaces were observed
underneath the adhesive bond. A combination of adhesive
and cohesive failure modes was observed when the bond
was broken which indicated very high performance levels.
Long-term exposure to high humidity or water submersion can
have the effect of making a polymer more resilient and tolerant
of high elongation. A subsequent lowering in peak force is also
measured after many days of exposure, usually on the order
of 40%. This effect is typical as it parallels the increase in
resilience and is the same trend often seen with structural
silicone sealants, which are also recognized for their durability.
Drying of the 3M
™
VHB
™
Tape bond, which occurs in a
normal environmental cycle, shows that this effect is reversible
and the bond returned to the original dry strength. Detailed
investigations showed that even silicones experience a similar
change in material properties after a continuous exposure to
water. Therefore, efficient draining of the structural joint is
essential for structural glazing constructions. Any uncoated
glass bonding application of 3M
™
VHB
™
Structural Glazing
Tapes that is subject to moisture or high humidity should
always have the glass surface treated with a silane solution as
described in the “Surface Preparation of Glass" section of this
manual.
After splashes or incidental contact with solvents such as fuels,
alcohols, adhesive removers like MEK, and even weak acids or
bases, no affect is measured on the bond performance. Some of
these solvents may be included in window cleaning solutions.
Only after continuous submersion in harsh fuels or solvents is
softening of the adhesive/foam experienced.
Note: While 3M
™
VHB
™
Tape products may withstand
occasional contact with these types of chemicals, continuous
exposure is not recommended.
Structural Performance Tests
3M
™
VHB
™
Structural Glazing Tapes have been used
worldwide in thousands of glazing applications in the
construction industry. To further support consideration for
structural glazing applications, performance tests were
conducted at an independent, accredited 3rd party test facility
(Winwall Technology Pte Ltd – Singapore) to evaluate 3M
™
VHB
™
Structural Glazing Tapes under stresses and
environmental conditions that glass panels would typically
experience in a glazed curtain wall system.
The glazed panels constructed with 3M
™
VHB
™
Structural
Glazing Tapes provided excellent performance overall
compared to control panels glazed with structural silicone
sealant. The first test sequence consisted of a PVB laminated
glass panel bonded with 3M
™
VHB
™
Structural Glazing Tape
4972, a double glazed unit (DGU) bonded with 3M
™
VHB
™
Structural Glazing Tape G23F and a DGU bonded with a
one-part structural silicone sealant. No failure was observed
with either the 3M
™
VHB
™
Tape glazed panels or the structural
silicone sealant glazed panel in any of the tests including
ASTM E 330 wind load structural tests at ambient, cold and
hot temperatures (-13ΊF and 160ΊF) up to 2.9 kPa (60 psf),
corresponding to a wind speed of 155 mph (250 kph). After
this, pressures were gradually increased up to 8.4 kPa (175 psf)
at ambient temperature conditions. At this point the laminated
glass failed and blew out of the chamber. However, glass was
still attached and bonded to the 3M
™
VHB
™
Structural Glazing
Tape 4972 around the perimeter of the frame demonstrating the
high strength of the tape.
A second test sequence patterned after the first test sequence
was run consisting of two single pane tempered glass lites
bonded to 3M
™
VHB
™
Structural Glazing Tape G23F and
one-part structural silicone sealant. The DGU panel bonded
with 3M
™
VHB
™
Structural Glazing Tape G23F was also
subjected to this second test sequence after surviving the first
test sequence. No failure was observed with either the 3M
™
VHB
™
Structural Glazing Tape glazed panels or the structural
silicone sealant glazed panel in any of the tests including
ASTM E 330 wind load structural tests up to 10 kPa (210 psf),
which corresponds to a sustained wind speed of 290 mph (467
kph). This testing protocol also demonstrated that no air or
water leakage can be obtained with proper assembly methods.
6
pg_0007
The following table summarizes the results of the
3rd party structural performance tests.
Subject to 2X cycling tests
Note: The limit of the test chamber was 10 kPa. Testing beyond this point was not possible. Panels were designed for a 2.9
kPa windload pressure. Testing beyond this design pressure demonstrates the safety factor used for 3M
™
VHB
™
Structural
Glazing Tapes.
7
Panels in 2nd Test
Sequence
Panels in 1st Test
Sequence
Test
3M
™
VHB
™
SGT One-Part Structural 3M
™
VHB
™
SGT One-Part Structural 3M
™
VHB
™
SGT
Sequence Test Method 4972
Silicone
G23F
Silicone
G23F
Laminated Glass DGU
DGU
8mm Tempered
8mm Tempered
Air
ASTM E283
No air leakage No air leakage
No air leakage
No air leakage
No air leakage
Infiltration
(at +0.3 kPa)
from panel
from panel
from panel
from panel
from panel
Water
ASTM E331
No water leakage No water leakage No water leakage No water leakage
No water leakage
Penetration
(at +0.72 kPa)
Temperature
20 cycles
For each cycle, temperature is maintained
For each cycle, temperature is maintained
Cycling
-25°C to 70°C
at –25°C for 15 minutes and +70°C Subjected to 40 cycles at –25°C for 15 minutes and +70°C
for 15 minutes (±2°C)
for 15 minutes (± 2°C)
Air
ASTM E283
No air leakage No air leakage
No air leakage
No air leakage
No air leakage
Infiltration
(at +0.3 kPa)
from panel
from panel
from panel
from panel
from panel
Water
ASTM E331
No water leakage No water leakage No water leakage No water leakage
No water leakage
Penetration
(at +0.72 kPa)
Windload
ASTM E330
± 2.9 kPa
± 2.9 kPa
± 2.9 kPa
Structural
-25°C, 32°C, 70°C
(60psf, 155 mph)
(60psf, 155 mph)
(60psf, 155 mph)
(hold for 1 minute)
No air leakage but
Air
ASTM E283
No air leakage No air leakage
No air leakage
presence of water
No air leakage
Infiltration
(at +0.3 kPa)
from panel
from panel
from panel
condensation seen on from panel
spacer tape
Windload
ASTM E330
±6 kPa
±6 kPa
±8 kPa
±8 kPa
±8 kPa
Structural
32°C
(125psf, 225 mph) (125psf, 225 mph) (167psf, 260 mph) (167psf, 260 mph) (167psf, 260 mph)
Maximum
(hold for 10 sec.)
Windload
Maximum
Glass burst at -8.4 kPa >-8.4 kPa
>-10 kPa
>-10 kPa
>-10 kPa
Structural
Pressure (±)
(175psf, 265 mph) 175psf, 265 mph) 210psf, 290 mph) 210psf, 290 mph)
210psf, 290 mph)
Destructive
pg_0008
8
Structural Glazing with 3M
™
VHB
™
Structural Glazing Tape
Introduction
A 3M
™
VHB
™
Structural Glazing Tape curtain wall system
is based on the tape acting as the main bonding agent
between the glass and the structural glazing frame. The
windload forces acting on the facade are transferred through
the 3M
™
VHB
™
Structural Glazing Tape to the structure of
the building. The 3M
™
VHB
™
Structural Glazing Tape must
maintain its strong bonding performance and strength in
order to support the glass panels during windload and other
environmental related events. 3M
™
VHB
™
Structural Glazing
Tape is usually only considered for four-sided or two-sided
shop glazed structural glazing applications and is the only
3M
™
VHB
™
Tape suitable for structural glazing applications.
The four-sided structurally glazed system is referred to as a
“unitized" curtainwall and should only be assembled in a
well controlled factory environment. Years of testing and real
life applications demonstrate the high performance capability
of this tape to meet the demanding requirements of this
application. It is important to note that whenever a 3M
™
VHB
™
Structural Glazing Tape project is initiated a
comprehensive process control plan, including review of the
project by 3M, adhesion testing, training of the fabricator
and in-process audits must be completed to promote a
successful project.
Note: specific process and quality control procedures
must be followed on all 3M
™
VHB
™
Structural Glazing Tape
projects in order to obtain a 3M
™
VHB
™
Structural Glazing
Tape Application Warranty.
Structural Joint Design
A typical structural glazing section with 3M
™
VHB
™
Structural Glazing Tape is given in Fig. 1.
Fig. 1: Glazing sections with 3M
™
VHB
™
Structural
Glazing Tape as the bonding agent
Design Considerations – Adhesion
Adhesion is the molecular force of attraction between
unlike materials, similar to a magnetic force. The strength
of attraction is determined by the surface energy of the
material. The higher the surface energy, the greater the
molecular attraction – the lower the surface energy, the
weaker the attractive forces. Greater molecular attraction
results in increased interfacial contact between an adhesive
and a substrate. In other words, on a high surface energy
material the adhesive can more easily flow or “wet" the
surface to obtain a stronger bond.
A glass surface is generally considered to be a high energy
surface. However, surface coatings such as reflective coatings
on the glass can change the surface energy of the glass.
Likewise, coatings or paint on metal frames will also change
the surface energy of a normally high energy surface like
bare aluminum. Thus, it is important to have the 3M
Technical Support Center review each 3M
™
VHB
™
Structural
Glazing Tape project and run adhesion tests to determine the
appropriate surface preparation method for each structural
glazing substrate. This will help to ensure that high bond
strength of the 3M
™
VHB
™
Structural Glazing Tape exists
to both bonding surfaces.
Design Considerations – Tape Width
The appropriate tape width is determined based on one or
two calculations depending on the design of the structural
glazing system. Laminated or insulated glass should always
have static (deadload) support as part of the framing system.
When the deadload is supported, a dynamic load calculation
is required to determine the appropriate tape width for the
application. For monolithic – single pane glazing applications,
deadload support is still recommended but it is up to local
governmental regulations, the fabricator/structural engineer
and the 3M Technical Service Representative to allow a
nonsupported 3M
™
VHB
™
Structural Glazing Tape project.
In structural glazing systems without deadload support,
Vertical Mullion
Horizontal Mullion
3M
™
VHB
™
Structural Glazing
Tape
Weather Sealant
Weather
Sealant
pg_0009
9
the weight of the glass places a constant load on the tape.
A static load and dynamic load calculation must be
performed for these applications.
Tape Width - Dynamic Loads
The minimum tape width for a structural glazing application
is dependent on three factors. The design strength of the
bonding agent (3M
™
VHB
™
Structural Glazing Tape), the
design pressure (dynamic wind load) requirement for the
building and the size of the glass panel. The tape must be the
appropriate width to fasten the glass panel and allow the
wind load to be transferred to the building structure.
For dynamic tensile or shear loads (such as windloads), a
design strength of 12 psi (8435 kg/m
2
or 85 kPa) is used
for 3M
™
VHB
™
Structural Glazing Tape. This design strength
guideline provides a safety factor of at least 5 and was
established based on material property testing as well as
ASTM dynamic load testing for curtain wall applications.
Years of real-life application success also supports the use of
this design guideline for this application.
The Trapezoid Rule is the industry recognized calculation
used for determining the appropriate bonding agent width for
a structural glazing application. This calculation is also com-
monly used to determine “structural bite" for structural sili-
cone sealant glazing applications and is also applicable for
3M
™
VHB
™
Structural Glazing Tape applications. This
calculation and examples are shown below:
Tape Width (inches) = 0.5 x panel short edge length (ft) x windload (psf)
12 in/ft. x tape design strength (12 lbs./in
2
)
Example: 4' x 6' lite of glass designed to withstand a 60 psf
windload
Tape Width (inches) = 0.5 x 4 ft. x 60 lbs./ ft
2
= 0.83" round up to nearest 1/4" 1.0"
12 in./ft. x 12 lbs./in
2
Note: Always round up to the nearest 1/4" and never
round down.
Tape Width (mm) = 0.5 x panel short edge length (mm) x windload (kg/m
2
)
Tape design strength (8435 kg/m
2
)
Example:1200 mm x 2400 mm lite of glass exposed to
a 295 kg/m
2
windload
Tape Width (mm) = 0.5 x 1200 mm x 295 kg/m
2
= 21 mm round up 25 mm
8435 kg/m
2
Note: Always round up to the nearest whole number
divisible by 5 and never round down for metric (mm)
calculations.
Tape Width (mm) = 0.5 x panel short edge length (mm) x windload (kPa)
Tape design strength (85 kPa)
Example: same as previous conditions with a windload
of 2.9 kPa
Tape Width (mm) = 0.5 x 1200 mm x 2.9 kPa = 21 mm round up 25 mm
85 kPa
This dynamic load calculation should be done to determine
the appropriate VHB
™
Structural Glazing Tape width for
each glass panel size in the glazing application. The static
load calculation must also be performed if the application is
for an unsupported monolithic glass application.
Tape Width - Static Loads (Deadload)
Structural glazing applications utilizing unsupported
monolithic glass require a static load calculation to
determine the appropriate width of 3M
™
VHB
™
Structural
Glazing Tape. A design strength guideline of 0.25 psi
(1.75 x 10
-4
kg/mm
2
) should be used for static load
calculations. This means that 4 sq. in. of 3M
™
VHB
™
Structural Glazing Tape per 1 lb. (55 sq. cm per 1 kg)
should be used to support static loads.
Important: Static load and dynamic load calculations should
be performed on unsupported deadload structural glazing
applications. The calculation resulting in the wider tape
width should be used as the appropriate tape width for the
application.
The following static load calculation is used to determine
the appropriate tape width.
Tape Width (inches) = glass panel weight (lbs.)
Glass perimeter (in.) x tape design strength (0.25 psi)
Example: 3' x 4' lite of monolithic glass with a weight of
2 lbs./ft
2
Tape Width (inches) = (3 ft. x 4 ft.) (2 lbs./ft
2
) = 0.57" round up 0.75"
168 in. x 0.25 lbs./in
2
Note: Always round up to the nearest 1/4" and never round down.
Tape Width (inches) =
glass panel weight (kg)
Glass perimeter (mm) x tape design strength (1.75 x 10
- 4
kg/mm
2
)
Example: 1000 mm x 1500mm lite of monolithic glass
with a weight of 10k kg/m
2
Tape Width (inches) =
(1 m x 1.5 m ) (10 kg/m
2
)
2 (1000 mm + 1500 mm) (1.75 x 10
- 4
kg/mm
2
) = 17 mm round up 20 mm
pg_0010
Important: A dynamic load calculation should also be per-
formed along with the static load calculation. For example, if
the 1000 mm x 1500 mm glass panel above were designed to
withstand a 1.4 kPa windload, the following dynamic load
calculation should be performed:
Tape Width (mm) = 0.5 x 1000 mm x 1.4 kPa = 8.2 mm round up 10 mm
85 kPa
In this example the static load calculation resulted in
wider tape width (20 mm) compared to the dynamic load
calculation (10 mm). Thus, to satisfy the static load and
dynamic load requirements, the wider tape width of
20 mm should be used for the application.
Design Considerations –
Differential Movement
3M
™
VHB
™
Structural Glazing Tape performs well in
applications where two bonded surfaces like glass and an
aluminum frame experience movement relative to each other
as a result of thermal expansion and contraction. 3M
™
VHB
™
Structural Glazing Tape can tolerate shear movement up to 3
times its original thickness (300% shear strain). This means
the 0.090" (2.3 mm) thick 3M
™
VHB
™
Structural Glazing
Tapes G23F or B23F can safely experience shear strain up to
0.27" (6.9 mm). The 0.080" (2.0 mm) 3M
™
VHB
™
Structural
Glazing Tape 4972 can safely experience strain up to 0.24"
(6 mm). The curtain wall system designer should calculate
the amount of joint movement and mismatch possible
between the glass panel and metal frame and determine if
this will result in less than 300% shear strain on the 3M
™
VHB
™
Structural Glazing Tape. An example of thermal
expansion movement and the associated calculation is
listed below:
Total % strain =
v
(panel short edge % shear strain)
2
+ (panel long edge % shear strain)
2
where
% shear strain =
100 x (frame length) x (frame CTE – glass CTE) x (max temp change)
tape thickness
The % strain in shear calculation listed above should be
calculated for both the short edge and long edge length. The
values calculated for each panel edge is then used to calculate
the total % strain on the tape. The maximum temperature
change should be calculated from the application temperature
to the greater temperature extreme – hot or cold.
Example:
1500 mm x 2000 mm glass lite bonded to an aluminum
frame. The 3M
™
VHB
™
Structural Glazing Tape G23F was
applied in a factory with a temperature of 21°C. The project
building is located in a hot temperature zone where the
maximum temperature of the building may reach 85°C.
The coefficient of thermal expansion (CTE) for glass is
9x10
-6
/°C and for aluminum is 24x10
- 6
/°C. The thickness of
the tape is 2.3 mm.
Short edge % strain =
100 (1500 mm) (24x10
- 6
/°C – 9x10
- 6
/°C) (85°C-21°C)/2.30 mm = 63%
Long edge % strain =
100 (2000 mm) (24x10
- 6
/°C – 9x10
- 6
/°C) (85°C-21°C)/2.30 mm = 84%
Total % strain =
v
(63)
2
+(84)
2
= 105%
This value is well within the design limit of 300% for 3M
™
VHB
™
Structural Glazing Tape. These calculations only
account for movement due to thermal changes. Other sources
of movement in the glazing system such as building settling,
slab deflection, seismic events, mismatch during assembly,
etc. should also be considered by the architect/curtain wall
designer to verify that they are within the design limit of
300% shear strain.
Materials Involved in Glazing
Structural glazing in general involves bonding of glass to a
supporting load bearing metallic frame work, with additional
components to aid the building movements and to seal
moisture entry. There are a variety of glasses and metallic
frames available and used in structural glazing applications.
Substrate Materials – Glass
3M
™
VHB
™
Structural Glazing Tapes form a durable bond
to clear float glass, but a facade has not only a visual effect
on the building but also the function of thermal insulation,
which is mainly achieved by the use of multifunctional
glasses with reflective coatings. Pyrolytic coatings of metal
oxides are applied on the float glass just after the float
process when the glass is still very hot. This makes the
coatings very durable and appropriate for structural glazing.
This type of coating is considered a “hard coating".
Alternatively, magnetron or “soft coatings" (coatings applied
off-line after glass has cooled) consist of thin layers of noble
metals (e.g. silver in low E coatings), which are not resistant
to environmental influences like oxygen and acid rain. This
causes surface corrosion and a gradual loss of adhesion. A
few glass suppliers have made great progress in developing
new generations of these soft coatings which are resistant to
these influences and may be suitable for structural glazing.
But this variety of coatings requires great efforts in adhesion
testing. The adhesion of 3M
™
VHB
™
Structural Glazing Tape
on any glass coating must be checked by a 3M Technical
Service Representative on each individual project. If
possible, it is preferred to apply the 3M
™
VHB
™
Structural
Glazing Tape to the uncoated side of the glass panel.
It is important to avoid excessively warped glass lites when
bonding with 3M
™
VHB
™
Structural Glazing Tape. Quality
glass manufacturers typically have far less warpage in their
finished product than are specified in ASTM standards for
glass flatness. In general, a glass lite should have < 0.072"
warpage for every 1 yd. length of glass or < 2 mm for every
1 m length of glass.
10
pg_0011
Substrate Materials - Metal Frames
The most typical frame material used in structural glazing
systems is aluminum. High grade stainless steel (316) is
occasionally used in structural glazing systems as well. The
different types of structural frames suitable for 3M
™
VHB
™
Structural Glazing Tape include alodine aluminum, anodized
aluminum, thermal set paint/coated aluminum and stainless
steel. Mill finish aluminum is typically not used for
structural glazing applications. In some cases non-typical
surface finishes may be specified for a 3M
™
VHB
™
Structural
Glazing Tape project. Always consult with the 3M Technical
Support Center for guidance in these cases.
A flat frame surface void of surface irregularities (along the
frame and at the joint seams) is required for 3M
™
VHB
™
Structural Glazing Tape applications. Mismatch in frame
corner joints should be limited to < 0.011" (0.3 mm). If
frames are welded, any weld marks in corners on the bonding
side must be < 0.011" (0.3 mm). Ideally these should be
abrasively removed. Frame profiles should have < 0.025"
warpage (non-flatness) for every 1 yd. length of profile
or < 0.70 mm for every 1 m length of profile. Laying a metal
yard or meter stick on the profile is a good way to measure
this. It is also important that the bonding area of the profile
is parallel to the glass surface. Some standard structural
silicone sealant glazing frames may not be suitable for
use with 3M
™
VHB
™
Structural Glazing Tape.
The width of the flat bonding surface must be adequate to
accommodate the calculated minimum tape width required
for the glazed panel. It is best to use a frame that will
accommodate the tape width yet leave little or no bare glass
exposed over the metal frame (see Fig. 1). The frame profile
should also allow for the application of a perimeter weather
sealant.
3M’s testing protocol will verify the adhesion characteristics
of the 3M
™
VHB
™
Structural Glazing Tape to the substrate
but do not in any way confirm the durability of the substrate.
Please contact a 3M Sales or Technical Service Representative
for further information.
Project Review
and Warranty Obtainment
3M
™
VHB
™
Structural Glazing Tape Sales, Marketing and
Technical Service Specialists are available to assist the
customer to determine the suitability of 3M
™
VHB
™
Structural Glazing Tape for structural glazing applications.
All 3M
™
VHB
™
Structural Glazing Tape projects must be
reviewed on a project-specific basis by a 3M Technical
Service Representative to begin the 3M
™
VHB
™
Structural
Glazing Tape application process. The project review and
associated adhesion testing must be successfully completed
along with fabricator training and process control and audit
documentation before 3M will issue a 3M
™
VHB
™
Tape
Structural Glazing Tape Application Limited Warranty.
A warranty application form is included in the back of this
manual. Additional forms are available from a 3M
™
VHB
™
Structural Glazing Tape Sales, Marketing or Technical
Service Specialist. It is important to complete the entire
warranty application form to ensure that 3M will be able to
accurately assess the 3M
™
VHB
™
Structural Glazing Tape
project. Required information in this form includes design
windload values for the building, glass dimensions and the
structural details related to the glazing system.
3M will provide bonding performance information of 3M
™
VHB
™
Structural Glazing Tape to the substrates and will also provide
training to the fabricator personnel in application procedures to
maximize tape bonding performance. The warranty program is
for those projects handled by approved 3M customers who
strictly adhere to and follow 3M specifications & instructions,
and is subject to certain conditions. The warranty application
and project review process is listed below:
Warranty Application/
Project Review Process
1. Structural glazing customer inquires about utilizing 3M
™
VHB
™
Structural Glazing Tape and the associated Limited
Warranty. A 3M Sales, Marketing or Technical Service
Representative works with the customer to fill out the
Customer Warranty Request Form which begins the 3M
™
VHB
™
Structural Glazing Tape application process.
Customer submits designs and drawings to 3M for
project review.
2. 3M Technical Service and Marketing Representatives
perform initial project assessment to determine general
suitability of 3M
™
VHB
™
Structural Glazing Tape for the
specific project.
3. If initial project review is acceptable, substrate materials
(glass and frame) must be submitted to perform a
complete technical evaluation of the project including
adhesion testing. The 3M Sales Representative requests
and obtains adequate samples of all appropriate substrate
materials and submits a Technical Service Request (TSR)
to the 3M Technical Service Representative.
Samples to be submitted:
Samples of all the substrates (frame and glass) that
will be joined with 3M
™
VHB
™
Structural Glazing Tape
should be submitted to the 3M Sales or Technical Service
Representative upon request to conduct all the necessary
adhesion and surface preparation analysis. The number of
samples required and dimensions are given below. Be
sure to identify the bonding surface of each substrate.
If the application utilizes insulated glass, it is acceptable
to provide samples of the bonding sheet of glass only
with the bonding side clearly marked.
Glass panel samples: 12'' x 12'' (300 mm x 300 mm) – 2 pieces
Frame extrusions: 12" (300 mm) length – 8 pieces
4. The 3M Technical Service Representative performs
appropriate adhesion testing of actual materials to measure
11
pg_0012
performance and provide requirements for surface
preparation of the substrates. This may take up to four
weeks from receipt of drawings and samples.
5. Technical service and marketing fill out Warranty
application documents and requirements using results
from the technical review. The warranty documents are
reviewed by the 3M legal department.
6. The customer reviews the Warranty documents and
requirements and agrees to terms including training,
fabrication requirements and process auditing.
7. The 3M Technical Service Representative develops
training materials with specific 3M
™
VHB
™
Structural
Glazing Tape application techniques plus any
project-specific instructions. 3M local Sales, Technical
Service or Marketing delivers on-site training before
project begins and fills out Application Training Document.
A mock-up may also be built at this point in the process.
8. Once production begins, a local 3M Sales, Technical
Service or Marketing Representative conducts periodic
on-site audits of actual assembly process and fills out
Audit Document.
9. Upon project completion, the customer fills out the
Warranty Application Document which states that
everything about the project was completed as described
and nothing significant about the design or materials used
in the project were modified. The warranty period begins
upon signing by the customer and 3M.
Additional Testing Requirements
Additional, non-standard testing may be required depending
on the wishes of the customer or the demands of the project.
Please consult your 3M Sales or Technical Service Representative
at the beginning of the project to determine if 3M is capable
of such testing services. 3M may charge a service fee for
non-standard testing outside of 3M internal testing capabilities.
Any statement made on behalf of 3M relating to an architectural
drawing, product formulation, engineering design, end-use
specification or similar document is limited to the knowledge
of product properties as determined by laboratory testing of
material produced by 3M. Any comments relating to any
subject other than such product properties are offered only to
call to the attention of the engineer, architect, formulator,
end-user or other person considerations that may be relevant
in his/her independent evaluation and determination of the
appropriateness of such design, drawing, specifications,
document or formula.
3M ASSUMES NO RESPONSIBILITY FOR AND SHALL
NOT BE LIABLE FOR THE ADEQUACY OR PROPRIETY
OF ANY MATERIALS USED FOR A PROJECT OR
THE PROJECT ITSELF, OR FOR ANY STRUCTURAL
DESIGN ELEMENTS IN THE PRINTS/SPECIFICATIONS
PROVIDED BY CUSTOMER FOR THE PROJECT, AND
3M EXPRESSLY DISCLAIMS ANY WARRANTY OR
RESPONSIBILITY WHATSOEVER FOR SUCH MATERIALS,
PROJECT OR STRUCTURAL DESIGN ELEMENTS.
12
Factory Glazing
Factory or “shop" glazed curtainwalls are assembled as
individual units (glass and frame bonded panels) in a
controlled environment where proper surface preparation
and tape application procedures can be maintained and
quality process control programs can be implemented and
documented. This is referred to as a unitized curtainwall
system and is usually the only glazing system approved for
3M
™
VHB
™
Structural Glazing Tape projects. A key benefit
of a unitized 3M
™
VHB
™
Structural Glazing Tape system is
the ability to assemble and handle the glazed panels in the
same day. This is due to the immediate handling strength of
a 3M
™
VHB
™
Structural Glazing Tape fabricated panel. If the
outdoor temperature is below 50ΊF (10ΊC) it is required
that the assembled panels be kept in the warmer, controlled
environment of the factory shop for 24 hours before
exposing to the colder temperatures.
Site Glazing
Site or “field" glazing is a method where the glass lites
are bonded to the metal frames at the construction site. This
fabrication technique is not recommended for 3M
™
VHB
™
Structural Glazing Tape projects. Please consult a 3M
representative if site gazing is to be considered for a 3M
™
VHB
™
Structural Glazing Tape project.
Application Techniques
This application procedure outlines general process
requirements for fabricating 3M
™
VHB
™
Structural Glazing
Tape glass panel units. It is important to follow these
fabrication techniques along with the recommendations in
the project specific 3M
™
VHB
™
Structural Glazing Tape
technical report from 3M to ensure good bonding performance.
Fabrication will only start after production personnel have been
properly trained by an appropriate 3M representative. The
procedures in this document are not intended to be a complete
and comprehensive quality assurance program as project
situations may vary from job to job. The basic steps involved
in a 3M
™
VHB
™
Structural Glazing Tape process are:
1. Establishment of appropriate work area
2. Surface preparation – glass and metal frame
3. Tape application
4. Pressure application
5. Weather sealant application
Application Procedure for 3M
™
VHB
™
Structural Glazing Tape
pg_0013
13
The Work Environment
It is important to establish an appropriate work area before
assembly of the structurally glazed glass panels. The
workplace should be free from excessive dust, dirt and other
airborne contaminants. The 3M
™
VHB
™
Structural Glazing
Tape will bond strongly to the surface it contacts. Should this
be a layer of dust, dirt, grease, oils, etc., then an inadequate
bond will be made to the component surface.
The workplace should be at a minimum temperature of 60°F
(15°C) and free from sources of wide temperature variations
such as open loading doors. All substrates for bonding and the
3M
™
VHB
™
Structural Glazing Tape should be conditioned at
60°F (15°C) minimum temperature in covered, weatherproof
conditions for a minimum of 12 hours or until it is verified
that the substrate is at or above the minimum temperature
requirement. 3M
™
VHB
™
Structural Glazing Tape is a
viscoelastic adhesive, which forms a bond by "wetting"
(making intimate contact with) the surfaces to which it is
applied. When temperatures are low, this wetting process is
slower, and it takes more time to reach full bond strength with
complete wetting-out of the surface. If the temperature of the
3M
™
VHB
™
Structural Glazing Tape roll or the components is
below 60°F (15°C), then the initial wetting may be so low that
full bond strength may not develop before the panel is erected,
and therefore put under load. Similarly, once the initial bond is
made, then the 60°F (15°C) minimum is still required, so that
the adhesive can continue to flow until full bond strength is
achieved. Approximately 90% of full bond strength is achieved
when the fabricated panels are held overnight at 60°F
(15°C) or above.
Rapid variations in temperature in the workplace should also
be avoided; many workshops have end-doors or roller shutters
to allow vehicle entry for deliveries, etc., and opening these can
cause a major change in both temperature and humidity which
may have a negative impact on the bonding process.
The Workbench
The workbench for bonding should be of an appropriate size
to accommodate the largest glass panel component to be
constructed as a single assembly. The workbench should be
stable, of a convenient height and should offer an even, flat
surface over the entire area. If several benches are used
together under a large frame, it is important that they all be of
equal height and stability and that the operator can reach and
apply pressure to all parts of the frame where a bond is
required to be made. Several benches of variable height and
construction brought together are not acceptable. When
benches are at different heights the frame/glass will not rest
squarely on the bench or be completely supported by the table
surface. Application pressure applied at one end of the
fame/glass may “bow" the panel, or create an opposing
separation force at the other end of the frame/glass, thus
breaking the previously made bond. Fig. 2 is an example
of a simple work bench.
Fig. 2: Workbench with support blocks for glass placement
The workbench should be covered with a material which will
not damage or contaminate the frame and the glass. The
workbench should be kept clean of dust, dirt, oils, silicones and
other contaminants. If possible it should be used solely as a
3M
™
VHB
™
Structural Glazing Tape application area. Support
blocks may be used to elevate the glass. Wood or another
non-damaging material may be used for supporting the glass.
Surface Preparation
Proper surface preparation is the critical first step in the
fabrication process. Proper preparation of a surface prior to
the application of a pressure sensitive tape is a key factor in
ensuring maximum bond strength. Contaminants act as a barrier
between the adhesive and substrate. Even a fingerprint on an
otherwise clean surface may impair adhesion. Care must also
be taken to examine surfaces for moisture, particularly during
periods of high humidity as it is possible for an invisible film
of water to be present.
Each project reviewed and approved by 3M will involve
adhesion testing of the actual project substrates (glass and
frame). A technical report will summarize this testing and will
require a specific surface preparation method for each
substrate. The fabricator must refer to this report for proper
guidelines on how to prepare the substrate surface to achieve
acceptable bonding performance. The procedures listed below
for glass and metal frame substrates provide more detail related
to proper surface preparation.
Surface Preparation of Glass
Be sure to remove any loose debris from the glass surface
before starting this glass preparation procedure.
pg_0014
14
Silane Treatment of Uncoated Glass:
Uncoated glass is a hydrophyllic (water loving) material and
in high humidity or frequent water contact applications the
3M
™
VHB
™
Structural Glazing Tape adhesive bond can be
"undercut" by moisture getting between the adhesive and the
glass surface. This causes bond weakening and can lead to
adhesive failures from the glass. To prevent this and to
change the hydrophyllic nature of glass it is necessary to
treat an uncoated glass surface in the bonding area. This is
done using 3M
™
Silane Glass Treatment AP115. Please note
the ‘USE BY’ date on the bottle to assure 3M
™
Silane Glass
Treatment AP115 is not beyond its expiration date. Glass
treatment is best achieved utilizing the following method.
Clean the bonding area of the glass surface, the area around
the perimeter, with a 50% solution of isopropyl alcohol
(IPA) in water. Important: IPA is a flammable solvent and all
appropriate safety procedures advised by the manufacturer
should be followed when working with this cleaning agent.
1. Use a clean, soft absorbent, lint-free cloth moistened
with the IPA/water mixture. Pour this solution onto the
cloth. Do not dip the cloth into the cleaning solution as
this will contaminate the cleaning agent. Alternatively,
the IPA/water solution may be sprayed onto the surface
and wiped with the clean cloth.
2. Wipe the glass vigorously in one direction moving
around the perimeter making sure the whole bonding
area is wiped clean. A white cloth works best for this
cleaning procedure as the removed contaminants will be
visible on the cloth. Continue this procedure until no
contaminants are visible on the cloth demonstrating the
glass has been thoroughly cleaned. Once the wipe has
been used, it should be immediately discarded into a
flameproof bin. This is a basic safety practice and also
serves to keep the work area clear and clean.
3. Immediately wipe the cleaned area with a fresh, clean
and dry cloth. Wipe around the perimeter in one direction
until the surface is completely dry.
After the surface has been thoroughly cleaned, follow with
the application of the 3M
™
Silane Glass Treatment AP115.
1. Moisten a clean, soft absorbent, lint-free cloth with the
silane solution and vigorously wipe over the area to be
bonded in one direction. Do not dip the cloth into the silane
solution as this will contaminate it. Alternatively, 3M
™
Silane Glass Treatment AP115 may be sprayed onto the
surface and vigorously wiped with the clean cloth around
the perimeter of the glass. Experience has shown that only a
very thin layer (monolayer) of 3M
™
Silane Glass Treatment
AP115 gives the best and most consistent results.
2. In an effort to achieve a monolayer, the primed area
should be re-wiped (in one direction) with a fresh, clean,
lint free, dry cloth immediately after initial application.
The glass should appear clear with no visible residue,
wetness or streakiness.
This procedure is commonly known as the “two cloth"
cleaning method. Fig. 3 shows an example of treating the
glass with the silane solution.
Fig. 3: Treatment of glass with silane solution
3M
™
Silane Glass Treatment AP115 is clear and should
not cloud or discolor glass. If clouding occurs it is due to
excessive solution being applied to the glass. If this happens
it is best to wipe aggressively over the treated area with a
dry, clean cloth to remove the residue. This must be done
prior to tape application.
Silicone contamination around the perimeter of glass is
also possible especially with insulated glass units. Silicone
contamination must be removed prior to the application
of 3M
™
Silane Glass Treatment AP115 to the glass and
application of 3M
™
VHB
™
Structural Glazing Tape. Refer
to the silicone manufacturers instructions for proper removal
of silicone contamination.
Surface treatment of coated glass will vary due to the
different types of materials and processes used for coating
glass. The fabricator will need to refer to the project specific
3M technical report for the appropriate surface preparation
of a coated glass surface.
Surface Preparation of Metal Frames
Aluminum is the most commonly used frame material for
structural glazing systems although high grade stainless steel
is occasionally used. The variability in metal finishes
(anodization type, paint type and color) necessitates the
testing of this substrate to determine the appropriate surface
preparation method. The fabricator should refer to the
project specific 3M technical report for proper guidelines
on how to prepare the metal substrate surface to achieve
acceptable bonding performance. The basic surface
preparation process for metal frames is listed below but
this does not replace surface preparation requirements in
the project specific technical report.
pg_0015
15
1. Abrasion: (if required per the
3M technical report)
If the frame is powder coated or enamel coated, the
painted surface may need to be lightly abraded in the
bonding area with a Scotch-Brite
™
Hand Pad. When
abrading, it is important to have a finely abraded surface.
Very small scratches in the surface, generated with a
multi-directional motion rather than straight-line motion,
are most desirable. A surface with many micro-scratches
can have up to 40% additional surface area, translating to
higher ultimate strength and greater initial adhesion.
Scotch-Brite
™
General Purpose Hand Pad 7447 (green or
maroon) are good for achieving the right level of abrasion.
Tools such as a random orbit, hand or power palm sander
will assist on large jobs. Avoid grinding a surface with
coarse abrasive materials, since they may create too rough
of a texture for the adhesive to adequately flow onto the
surface. When using abrasive paper, the grit value should
be finer (higher number) than 320 grit. Abrasion is only
needed in the area of the frame where the 3M
™
VHB
™
Structural Glazing Tape will make contact – the bonding
area. After abrasion, always clean the surface with the
IPA/water solution described below in the Surface
Cleaning section and be certain that all loose
particles are removed prior to tape application.
2. Surface Cleaning:
The bonding area of the structural glazing frame must
always be cleaned before tape application. On surfaces
where there appears to be little or no contamination, a
light oily film or other light contamination may be
present. Use the 50:50 blend of IPA/water for surface
cleaning. Use a “two cloth" cleaning procedure when
cleaning the bonding area of the metal frame with the
IPA/water solution. Once the part is clean and dry, tape
bonding should begin shortly after to minimize the
potential for recontamination. The only exception to this is
if a primer is required per the project specific requirements
in the 3M technical report. Priming of the frame will
follow the IPA/water cleaning step.
Where heavy oils or grease are present, a “degreasing"
solvent such as 3M
™
Prep Solvent 70 or 3M
™
Adhesive
Remover (Citrus Base) are suggested to cut the oil. This
should always be followed by the “two cloth" IPA/water
cleaning procedure to help ensure that any solvent residue
or film is removed.
Note: These cleaner solutions contain greater than 250 g/l
of volatile organic compounds (VOC). Please consult
your local Air Quality Regulations to be sure the cleaner
is compliant. When using solvents, be sure to follow the
manufacturer’s precautions and directions for use when
handling such materials.
3. Priming: (if required per the
3M technical report)
Priming a surface can significantly improve initial and
ultimate adhesion to many materials such as painted metal
surfaces or coated glass because of their low surface
energy or the additives they may contain. A primer
creates a new, higher energy surface to adhere to with the
3M
™
VHB
™
Structural Glazing Tape. The project specific
3M technical report will state if a primer is required for
adequate bonding performance of the 3M
™
VHB
™
Structural Glazing Tape.
3M
™
Primer 94 can be applied either with a brush, clean
cloth or dauber bottle. A thin single coat is sufficient.
Avoid applying excess primer where “puddling" may
occur. The primer should be allowed to dry leaving a tack
free film. Once dry, tape bonding should be started to
minimize the potential for recontamination.
3M
™
Adhesion Promoter 111 should be applied to a clean
cloth and then applied to the frame bonding surface. The
“two cloth" cleaning method should be employed with
this adhesion promoter. It is important not to leave a
pool of this adhesion promoter solution on the substrate
surface. There should be no visible residue left on the
surface after the proper application of 3M
™
Adhesion
Promoter 111. Once dry, tape bonding should be started
to minimize the potential for recontamination. Fig. 4
shows an example of this primer being applied to a
frame profile.
Fig. 4: Application of adhesion promoter
Note: 3M
™
Primer 94 and 3M
™
Adhesion Promoter 111
contain greater than 250 g/l of volatile organic compounds
(VOC). Please consult your local Air Quality Regulations
to be sure the primer is compliant. When using solvents,
be sure to follow the manufacturer’s precautions and
directions for use when handling such materials.
pg_0016
16
3M
™
VHB
™
Structural Glazing Tape
Application
The 3M
™
VHB
™
Structural Glazing Tape may be applied to
either the glass or frame surface first. It is best to apply the
tape to the glass if a clean sight line (minimal or no visible
air entrapment – bubbles) is desired. However, applying the
tape to the frame first may bring additional process benefits.
A reflective glazing application may be suitable for this since
the tape will not be visible behind the glass. Application of
the tape should occur very shortly after the two bonding
surfaces have been prepared as outlined in the Surface
Preparation section of this technical guide. Your 3M Sales or
Technical Service Representative will help you determine the
best tape application method based on the project specific
requirements. This guide will discuss the application of the
tape to the glass first.
1. Tape Application to Glass and
Pressure Application:
The tape should be handled at the edges or by the
protective liner with effort made to avoid contact with the
exposed and tacky bonding surface. Excessive contact
with the bonding surface may contaminate the tape and
reduce bonding performance. Apply the tape to the glass
surface aligned with the edge starting in one corner
working down the entire length of the glass lite. Leave a
small amount of tape extending over the edge of the glass
on both ends (Fig. 8). Repeat this procedure along the
entire periphery of the glass. It is best to apply light
pressure to the tape as it makes first contact with the glass
to avoid air entrapment (bubbles) between the tape and
the glass. A small roller, squeegee or even fingers may
be used for this step. The tape can be “butt" jointed at the
corners or overlapped and cut at a 45Ί angle for a cleaner
look. The graphic below (Fig. 5 and 6) illustrates proper
application of 3M
™
VHB
™
Structural Glazing Tape by
hand or with a tape applicator.
Fig. 5: Hand tape application
Fig. 6: Tape applicator
After application of the tape, pressure is applied to the tape
around the entire periphery with a squeegee, manual or
automatic rubber roller to ensure proper surface contact (Fig. 7).
Fig. 7: Initial pressure application
Fig. 8: Taped corner
pg_0017
2. Tape Cutting and Splicing
3M
™
VHB
™
Structural Glazing Tape should be cut using
a proper utility knife with a stable and sharp blade.
Retractable knives with long cutting edge blades work
well for tape cutting. Tape corners can be finished
utilizing a simple miter cutting procedure (Fig. 9, 10 and
11). A simple miter cutting tool can be fabricated or may
be available from 3M. After cutting through both layers
of tape carefully remove the excess pieces left over the
edge (Fig. 10). Take care again to only contact the edge
of the tape that will remain bonded to the glass. Once
the excess is removed carefully align the two miter (45°)
cut edges so they make contact. Then apply finger and
roller pressure to the tape in the direction from the
middle of the tape length moving towards the tape
seam (Fig. 11).
Fig. 9: Miter cutting procedure with miter cutting tool
Fig. 10: Tape waste removal
Fig 11. Corner finishing
To achieve a good quality result it is recommended to replace
the knife blade frequently. A dull blade may tear the tape and
result in less than desirable looking joint seams. Take care not
to press the knife blade excessively hard through the tape onto
the glass as this could result in scratching of the glass surface.
When the 3M
™
VHB
™
Structural Glazing Tape roll ends in the
middle of a glass edge or frame the same general procedure is
used as than shown in Fig. 9 and 10. The tape is overlapped
and then cut accordingly with the waste removed. However use
a 90° cut instead of a 45° cut for this procedure. Take care to
only touch the edges of the tape that will remain bonded to the
glass. Carefully bring the cut edges of the tape together in
proper alignment forming a “butt" splice. Apply finger or
roller pressure moving towards the splice from both sides of
the seam.
3. Joining of Parts
and Final Pressure Application:
The graphic below (Fig. 12) shows a possible way to stage
the structural glazing frame and glass on the workbench.
The structural glazing metal frame is placed first on the
table with the previously prepared bonding surface up.
Fig. 12: Lifting frame to contact tape on glass
17
pg_0018
The glass support blocks are placed inside the perimeter of
the frame. Next, the glass is placed on the support blocks
with the tape (inside surface) facing down. The liner is
then removed and the frame is lifted up to make contact
with the exposed, tacky tape surface.
The glass should be sized such that when it is bonded to
the frame there is a gap between the edge of the glass and
the deadload support fin of the structural glazing frame
around the entire perimeter of the glass. This will leave a
space to fill with an appropriate sealant to form a weather
seal for the assembled unit. Four 90Ί spacers with a
thickness of 1.5-2.0 mm placed in the frame corners prior to
joining the parts together can help to provide this uniform
gap around the perimeter of the glass for the weather sealant.
The spacers should be taller then the glass is thick to allow it
to be removed easily from the assembly once the parts are
joined together. Spacers are useful for glazing systems that
have a lip extending around the entire perimeter edge
of the glass.
If spacers are not available or an alternative frame style is
used a technique known as “pig-tailing" may be used to
properly align the glass with the frame (Fig 13 and 14).
This technique involves removing about a 4" (10 cm) long
section of the tape release liner from each corner of the
glass in both directions. This section of liner is then folded
inward or outward – like a loose “pig-tail". The frame is
then positioned to make contact with the tape/glass.
Alignment will still be possible because most of the tape
is still covered by the protective liner. Once proper
alignment is achieved, apply light pressure to the corners
where the release liner has been removed from the tape.
The frame should remain in place after the light pressure
application. The loose “pig-tail" of liner can then be
grasped to remove the remainder of the liner by carefully
pulling it from under the frame.
Fig. 13: “Pig-tailing" technique
Fig. 14: Frame set on glass and liner
Once the glass and frame are bonded together using either
of the techniques described above, final application pressure
must be applied around the entire perimeter of the glass and
frame – over the entire bonding area. There are several ways
to accomplish this. One way is to remove the support blocks
so the frame is resting on the table with the glass up. The
hand held roller can then be used to apply roll down pressure
of at least 15 psi (1 kg/cm
2
). The roller of the hand held
roller should be made of a non-damaging material. An
alternative way to apply final application pressure is to use
a locking pliers type tool with roller ends. The rollers are
placed over the glass and frame and locked in place applying
“pinching" pressure to the assembly. The pliers are then
pulled around the perimeter. The pliers must be checked to
make sure a minimum of 15 psi (1 kg/cm
2
) of pressure is
being applied to the assembled parts.
The methods described above for tape and pressure
application are fairly simple methods for panel fabrication
with 3M
™
VHB
™
Structural Glazing Tapes. Equipment is
also available that can be used to automate or semi-automate
the application of tape and the application of pressure.
Please consult a 3M Sales, Marketing or Technical Service
Representative for more information on automation of the
3M
™
VHB
™
Structural Glazing Tape bonding process.
18
pg_0019
Weather Sealant Application
A neutral-curing (non-acidic) silicone sealant should be
applied around the entire perimeter of the glass once it’s
bonded to the structural glazing frame (Fig. 15 and 16).
This will act as a weather sealant and help to protect the
3M
™
VHB
™
Structural Glazing Tape from potentially
aggressive glass cleaning agents and should be done while
the glazed units are still in the shop if possible. Sealant may
be applied immediately after final pressure application to
the assembled units. Use an appropriate sealant that has the
required performance and durability for the application. It
is important to apply the sealant around the entire perimeter
of the glass to establish a proper seal. Acid curing silicone
sealants are known as “acetoxy cure" silicone sealants
and should be avoided.
Fig. 15: Frame bonded to glass
Fig. 16: Weather sealant application
A backer rod may be placed in the weather sealant gap
prior to filling with silicone sealant. The backer rod is
typically a size (diameter) approximately 25% greater than
the joint cavity and must be placed as deep as possible into
the weather sealant gap. This is to ensure that the majority of
the glass edge has weather sealant between it and the metal
frame. Consult first with a 3M Technical Service
Representative if considering the use of a backer rod.
Masking tape may be used on the glass face and the outside
edge of the metal frame to keep excess weather sealant from
contacting these areas to ensure an aesthetically pleasing
finished product. Remove the masking tape before the
sealant skins over (within about 15 minutes after application
of the sealant).
Important: When using silicone sealants, be careful to
avoid contaminating other pre-bonded parts or works areas
where 3M
™
VHB
™
Structural Glazing Tapes will be applied.
It is best to have the silicone sealant applied in an area away
from where tape is being applied and surfaces are being
cleaned. It should also be done by someone who is not
involved in surface cleaning or tape application activities.
19
pg_0020
20
Bond Build Rate
After proper application of the tape as described above,
the bond strength will increase as the adhesive flows onto
the surface making more intimate contact. There is no curing
reaction taking place. At room temperature (70Ί F/21ΊC),
approximately 50% of the ultimate strength will be achieved
in 0 to 20 minutes after pressure application, 75% after
approximately 1 hour, 90% after 24 hours and 100% after
72 hours. In some cases, bond strength can be increased
and ultimate bond strength can be achieved more quickly
by exposure of the bond to elevated temperatures (e.g.
150°F) or when the surfaces are either abraded or primed.
In these cases ultimate bond strength may be achieved in
as little as one hour. After assembly the glazed units can be
handled and stacked for storage or shipment. They should
remain in an environment at a minimum temperature of
60Ί F (15ΊC) for 24 hours before the assembled units have
significant forces acting on the 3M
™
VHB
™
Structural
Glazing Tape joint. The assembled units can be stacked
horizontally immediately after pressure application. Be sure
to use appropriate spacers between each glazed unit when
stacking horizontally. The units can also be placed
vertically but there must be deadload support for the glass.
Sloped Glazing
Sloped glazing is a type of structural glazing used for
non-vertical applications. An example of this is for skylight
applications. The calculations for a sloped glazing application
will vary slightly from the conventional calculations listed
earlier in this technical guide. Please contact a 3M
representative to help determine the suitability of 3M
™
VHB
™
Structural Glazing Tape for a sloped glazing
application. Local building codes may also influence the
design and testing requirements of a sloped glazing system.
Protective Glazing
3M
™
VHB
™
Structural Glazing Tape has been tested for
use in protective glazing systems including missile impact
and hurricane pressure cycling. 3M
™
VHB
™
Structural
Glazing Tape is only one component of a system that
includes the framing system, glass and laminate. Bomb
blast systems also involve intricate systems to absorb and
dissipate the high energies associated with that type of
event. The unique energy absorbing/stress relaxation
characteristics of viscoelastic 3M
™
VHB
™
Structural
Glazing Tape demonstrates the potential to consider it
for these types of applications. 3M does not provide
“approval" for these types of systems as the system
designer is usually required to test their unique design.
3M Technical Service Representatives are available to
offer consultation if a protective glazing system utilizing
3M
™
VHB
™
Structural Glazing Tape is being considered
for an application.
Glass Replacement and Remedial Glazing
Glass breakage may occur during any phase of a construction
project or after the project has been completed. It is important
to consider how the system will be replaced or re-glazed in
the event of glass breakage. This may vary from project to
project dependent on the design of the glazing system.
Always contact your 3M representative for specific advice on
this process. Listed below are some general guidelines on the
replacement or re-glazing of a 3M
™
VHB
™
Structural Glazing
Tape structurally glazed unit.
Replacement Glazing Due to Glass Breakage
The following procedure is specific for a 3M
™
VHB
™
Structural Glazing Tape structurally glazed system. The
application should be verified as a 3M
™
VHB
™
Structural
Glazing Tape project and the original project specific 3M
technical report should be available for reference. Contact
your 3M representative if this information is not available.
Prior to deglazing an assessment must be made by a 3M
representative along with other building and contractor
representatives to determine the cause of failure. A written
record of this inspection should be retained by all
appropriate parties.
It is recommended to replace the entire frame and glass panel
unit, if possible, with a newly fabricated unit. If this is not
possible, follow the deglazing procedure described below.
1. Cutting through the 3M
™
VHB
™
Structural Glazing Tape
bondline is the most effective way of separating the glass
lite from the structural frame. This will require special tools
such as piano wire (Fig. 17), an automatic sealant cutter
(Fig. 18) or a sharp blade to cut through the 3M
™
VHB
™
Structural Glazing Tape. Use a lubricant such as liquid
soap to quicken cutting through the tape. Care should be
exercised to avoid damaging of the frame surface or the
glass if they are to be used in the re-glazed unit.
Fig. 17: Cutting through tape with “Piano Wire"
pg_0021
Fig. 18: Automatic sealant cutter
2. Residue removal – The 3M
™
Stripe Off Wheel (part
# 07498) is a special rubber disk which mounts to a 3/8"
electric drill and can be used to remove the adhesive
residue from the glass panel and metal frame. When the
rotating disk is brought in contact with the adhesive
residue, it lifts and removes the adhesive from the surface.
The wheel will not damage the surfaces if used properly.
It may help to remove the bulk of the adhesive residue
with a razor or sharp knife before using the Stripe Off
Wheel. Another alternative is to grasp a portion of the
adhesive residue and attempt to stretch and release the
tape from the frame or glass. This should be attempted
before cutting the adhesive residue and often results in
a complete and clean removal.
The graphic below (Fig. 19) depicts the use of the 3M
™
Stripe Off Wheel.
Fig. 19: 3M
™
Stripe Off Wheel
Note: Follow manufacturer’s safety instructions and
precautions for tool operation and use. 3M
™
Adhesive
Remover (Citrus Base) can be utilized to remove the last
residue. Follow solvent manufacturer’s precautions and
directions for using cleaners.
3. Clean the glass and frame surface with the “two cloth"
cleaning procedure utilizing the IPA/ water solution
described earlier in this technical guide. The original
project specific technical report should also be referenced
to determine if priming or abrasion is required for
maximum bonding performance. Be sure that all the
adhesive residue and sealant residue are removed before
re-glazing.
4. Apply 3M
™
VHB
™
Structural Glazing Tape to the glass
as described in the 3M
™
VHB
™
Structural Glazing Tape
Application section of this document. Be sure to use the
correct width of tape based on the appropriate structural
calculations for the application.
5. Place the glass into the structural glazing frame. It is
probably best to use the “pig-tailing" method described
earlier in this document. A temporary and removable
spacer should be put along the deadload support fin of the
structural glazing frame to assure that a consistent gap is
maintained between the edge of the glass and frame for
application of silicone weather sealant.
6. Application of pressure – apply a minimum of 15 psi roll
down pressure along the entire perimeter of the re-glazed
unit to ensure that the tape has made good contact with
both the glass and frame surfaces. The glass lite should
fit properly into the structural frame without forcing.
There should be no evidence of excessive visible gaps or
distortions. If this cannot be accomplished, the structural
frame will need to be removed and replaced with a new,
structurally sound frame.
7. Temporary fasteners should be used to hold the re-glazed
glass lite in place for a minimum of 24 hours assuming a
minimum temperature of 60ΊF (15°C) at the tape
bondline.
8. Remove the temporary fasteners and temporary
spacers along the bottom edge of the glass. Apply a
bead of silicone weather sealant around the entire edge
of the glass as described earlier in the Weather Sealant
Application section of this technical guide.
Replacement Glazing Due to
System Failure
Please consult a 3M representative if the re-glazing project
includes a major remedial operation to help determine the
cause of the system failure. It is important to document dates
and project specific details related to the system failure to
determine the best remedial solution.
21
pg_0022
22
The 3M
™
VHB
™
Structural Glazing Tape project checklist
and an initial blank warranty request form is provided on
the following pages. Adhesion test results and application
specific guidelines and instructions are generated by 3M for
each 3M
™
VHB
™
Structural Glazing Tape project. Training
and audit documents are also provided by 3M and must be
available from the contractor, fabricator or owner in the event
of a warranty claim or inspection for review by 3M and/or the
local building official.
The customer should retain these documents for the
length of the warranty period. Contact your 3M Sales
Representative for questions related to these documents or
the quality control process. 3M is available to assist in the
implementation of a quality control program.
Quality Assurance and Warranty Documentation
pg_0023
1. Project Initiation
2. Technical Assessment
3. Project Approval
4. Fabrication Training
5. Quality Assurance and Production Control
6. Project Completion
For additional information on 3M
™
VHB
™
Structural Glazing
Tapes and associated applications please visit
www.3m.com/vhb/structuralglazing.
3M
™
VHB
™
Structural Glazing
Tape Project Checklist
The following checklist activities must be completed for 3M
™
VHB
™
Structural Glazing Tape projects. Check off on each
item below by filling in a date of completion for each activity.
Copy the document and submit to 3M representatives. Retain
the original document for the life of the warranty.
23
Project glazing is complete and 3M and customer
sign off on Warranty Application Document
Form 1.4. – warranty period begins
Customer performs daily quality and process
control procedures and documents on a production
control sheet
3M representative conducts production audits and
documents in Audit Form 1.3
3M representative provides project specific training
to fabrication personal
Training Application Document Form 1.2 signed by
fabrication personal
Initial contact and project review with 3M Sales
Representative
Fill out Customer Warranty Request Form 1.1
Submit project drawing and Warranty Request Form
to 3M for review
Initial project assessment completed by 3M
Materials submitted for adhesion testing (jobsite
representative glass and frame)
3M Technical Service Representative completes
project specific technical report
3M fills out project specific warranty documents:
Schedule A – Required Application Procedures,
Schedule B – Application Description and
Materials List
3M submits warranty documents and
recommendations to customer
Customer reviews and agrees to project specific
warranty and recommendations
Signs Customer Agreement Form
pg_0024
pg_0025
3M
™
VHB
™
Structural Glazing Tape Application
Customer Warranty Request Form 1.1
Warranty Request Form to be completed by 3M Sales, Marketing, or Technical Service Representative, and Customer.
Document returned to 3M to initiate Initial Project Assessment.
Date of Request
3M Contact (Initiator):
Field Location:
Phone Number:
Customer (Fabricator) Name:
Customer Contact:
Customer Phone:
Customer Address:
Building (Project) Name:
Building Address:
Building Height:
Number of Floors:
General Contractor (if relevant):
Consultant /Control Office (if relevant):
Architect and Firm (if relevant):
25
Project Materials
Glass Type:
Insulated (IG)
Stepped Glass: Ye s No
Laminated
Monolithic
Glass Finish:
Uncoated
Coated – Coating Type:
Glass Bonding Side: Coated Side
Uncoated Side
Glass Manufacturer:
Frame Type (model):
Frame Manufacturer:
Frame Material: Aluminum
Stainless Steel
Frame Finish:
Anodized – Color:
Painted – Color and Type:
Bare
Does the frame provide deadload support. Yes No
Note: The frame must provide deadload support for insulated glass (IG) lites as well as other glass types depending on the thickness/weight.
Project Specific Design Parameters
Design Required Windload (Design Pressure):
Hurricane Area. Yes No
Glass Lite Dimensions
Thickness (include both
Glass Lite # Width (in.) Height (in.) Quantity/Project Vision or Spandrel lites and space if IG) Weight of Glass Lite
1
2
3
4
5
6
7
Estimated Project Volume (total length of tape): Lineal ft.
Lineal yds.
Note: width of tape will be determined by project specific calculations
Other Considerations (seismic region, etc.):
Has the customer/fabricator previously been trained for 3M
™
VHB
™
Structural Glazing Tape projects. Yes No
NOTE: Customer assumes responsibility for meeting local business codes
pg_0026
pg_0027
For unlisted countries please contact
Mark Jennings at 651-736-6076
United States:
Technical Service – Steve Austin 651-736-1259
Marketing – Mark Jennings 651-736-6076
Asia Pacific (Singapore), Ken Goh +65-6849 3460
Australia, Graham Honeyman +61-2-9498 9218
China, Tony Z. Wang
+86-21-22102408
Hong Kong, Dorothy Or +85-2-28066267
India, Vijay Krishnan
+93-419 8 0126
Indonesia, Wisnu Hidayat +62-8164804944
Japan, Yoshiharu Maeda +81-3-3709 8323
Korea, Sung-Wook Shin +82-11-728 1824
Malaysia, Gregory Wong +60-3-7806-2888
New Zealand, June Tienstra +64-9-443 9177
Philippines, Trixie Mary S. +63-2-813 3781 to 95
Singapore, Wong Huay
+65-6450 8824
Taiwan, Evy Yang
+88-6-2-3701 3314
Thailand, Suppakij Pakaichorat +66-2-260-8577 ext 384
Vietnam, Hien Ngo Vien +84-8-8640986 ext 131
Europe
+49-2131-14 2669
Austria
+43-1 86 686 / 270
Belgium
+32-2 722 51 95
Denmark
+45-43 48 01 00
France
+33-1 30 40 26 63
Germany
+49-2131-14 3465
Gulf
+971-4265 212
Italy
+39-02-70352526
Netherlands
+31-55 540 2323
Poland
+48 22 739 60 10
Pakistan
+92-21-111-225536 Ext. 350
Russia
+7 (095) 784-74-74
Spain
+34 91 321 6774
Sweden
+46 8 92 23 42
Switzerland
+ 41 1 724 91 91
Norway
+46 8 92 23 42
Israel
+972 9 9615032
United Kingdom,
+44-1344 857841
& Ireland
For unlisted Latin American countries please contact:
Dave Tronnes
(651) 737-3426
Argentina, Pablo E. Rozanski 54 11 4339 2604
Brazil, Pedro Terzi
55-019-38387295
Colombia, Julian Pardo
57-1-4108555 or
57-1-4161666
El Salvador,
Maria Eugeniade Tomasino (503) 2210-0833
El Salvador, Mario Gonzalez (503)2210-0832
Guatemala, Carlos Lemus (502) 2379-3636, ext. 3620
Jamaica, Fernando A. Johnson (876) 920-1787
Mιxico, Roberto Gonzαlez (55) 52-70-20-48
27
Global 3M Contact
Information for 3M
™
VHB
™
3M
™
VHB
™
Structural
Glazing Tape:
pg_0028
3M Industrial and Transportation Business
3M Industrial Adhesives and Tapes Division
3M Center, Building 21-1W-10
900 Bush Avenue
St. Paul, MN 55144
Toll-free: 1-800-362-3550
Fax: 651-778-4244
www.3M.com/vhb
3M, VHB and Scotch-Brite are
trademarks of 3M Company
Printed in U.S.A.
©3M 2007
Certification/Recognition
MSDS: 3M is not required to prepare an MSDS for these products which are not subject to the MSDS requirements of the
Occupational Safety and Health Administration’s Hazard Communication Standard, 29 C.F.R. 1910.1200(b)(6)(v). When used
under reasonable conditions or in accordance with the 3M directions for use, these products should not present a health and safety
hazard. However, use or processing of the products in a manner not in accordance with the directions for use may affect their
performance and present potential health and safety hazards. TSCA: These products are defined as articles under the Toxic
Substances Control Act and therefore, are exempt from inventory listing requirements.
Product Use
All statements, technical information and recommendations contained in this document are based upon tests or experience that
3M believes are reliable. However, many factors beyond 3M’s control can affect the use and performance of a 3M product in a
particular application, including the conditions under which the product is used and the time and environmental conditions in
which the product is expected to perform. Since these factors are uniquely within the user’s knowledge and control, it is essential
that the user evaluate the 3M product to determine whether it is fit for a particular purpose and suitable for the user’s method of
application.
Limited Warranty
3M warrants for 24 months from the date of manufacture that 3M
™
VHB
™
Tape will be free of defects in material and
manufacture. 3M MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO,
ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. This limited
warranty does not cover damage resulting from the use or inability to use 3M
™
VHB
™
Tape due to misuse, workmanship in
application, or application or storage not in accordance with 3M recommended procedures. AN APPLICATION WARRANTY
EXPRESSLY APPROVED AND ISSUED BY 3M IS AN EXCEPTION. THE CUSTOMER MUST APPLY FOR A SPECIFIC
APPLICATION WARRANTY AND MEET ALL WARRANTY AND PROCESS REQUIREMENTS TO OBTAIN AN
APPLICATION WARRANTY. CONTACT 3M FOR MORE INFORMATION ON APPLICATION WARRANTY
TERMS AND CONDITIONS.
Limitation of Remedies and Liability
If the 3M
™
VHB
™
Tape is proved to be defective within the warranty period stated above. THE EXCLUSIVE REMEDY, AT
3M’S OPTION, SHALL BE TO REFUND THE PURCHASE PRICE OF OR TO REPAIR OR REPLACE THE DEFECTIVE
3M
™
VHB
™
TAPE. 3M shall not otherwise be liable for loss or damages, whether direct, indirect, special, incidental, or
consequential, regardless of the legal theory asserted, including but not limited to tort, contract, negligence, warranty, or
strict liability.

EUGlass, Distributors for 3M Construction

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