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August, 2018
3M™ VHB™ Tape 4941
Product Description
Finite Element Analysis (FEA) data is available for this product at: 3m.com/FEA
3M™ VHB™ Tape 4941 is a 0.045 inch (1.1 mm) thick gray double coated acrylic foam tape with paper liner.
The multi-purpose acrylic adhesive on both sides bonds to a broad range of high and medium surface energy
substrates including metals, glass and a wide variety of paints and plastics as well as plasticized vinyl. The
conformable foam provides good contact between substrates even when they are slightly mismatched. 3M™
VHB™ Tape 4941 is part of the 4941 tape family. Each product in this family has multi-purpose acrylic
adhesive and conformable foam but varies in thickness, color and liner type.
Product Features
• Fast and easy-to-use permanent bonding method provides high strength and long-term durability
• Virtually invisible fastening keeps surfaces smooth
• Can replace mechanical fasteners (rivets, welds, screws) or liquid adhesives
• Gray, 0.045 in (1.1 mm), multi-purpose adhesive and conformable acrylic foam core o ers a good balance of
strength and conformability
• Eliminate drilling, grinding, re nishing, screwing, welding and associated clean-up
• Creates a permanent seal against water, moisture and more
• Pressure sensitive adhesive bonds on contact to provide immediate handling strength
• Allows the use of thinner, lighter weight and dissimilar materials
• UL GREENGUARD and UL GREENGUARD Gold Certi ed, contributing to LEED Credit
3M™ VHB™ Tape 4941
Technical Information Note
The following technical information and data should be considered representative or typical only and should not be used for speci cation purposes.
Typical Physical Properties
Property
Values
Color
Gray
Tape Thickness
1.1 mm
Thickness Tolerance
±10 %
Adhesive Type
Multi-Purpose Acrylic
Foam Type
Conformable Acrylic
Foam
Density
720 kg/m³
Liner
DK Paper
Liner Thickness
0.08 mm
Liner Color
White (printed)
Method
Notes
ASTM D3574
Foam with adhesive
0.045 in
45 lb/ft³
0.003 in
Typical Performance Characteristics
Dwell
Dwell/Cure
Time Temp Temp Environmental
MethodTime Units C
F
Condition
Substrate
BackingNotes
Property Values
90°
22
Peel
lb/in
Adhesion
39
ASTM 72
N/cm
D3330
Normal
Tensile
85
lb/in²
590
kPa
hr
ASTM 72 hr
@
D897 Room
22C
72F
Test
Condition
52%RHStainless
2 mil 12 in/min (300 mm/min)
Aluminum
Steel Foil
Aluminum
1 in² (6.45 cm²), Jaw Speed 2 in/min (50.8 mm/min). Peak force
to separate is measured.
Temperature
Table continued on next page
Room
Temperature
3M™ VHB™ Tape 4941
Typical Performance Characteristics (continued)
Dwell
Dwell/Cure
Time Temp Temp Environmental
MethodTime Units C
F
Condition
Substrate
BackingNotes
Property Values
Overlap
Shear
Strength
480
kPa
70
lb/in²
ASTM 72 hr
@
D1002 Room
Stainless
Test
Condition
1 in² (6.45 cm²), Jaw speed 0.5 in/min (12.7 mm/min). Peak force
to separate is measured.
Steel
Temperature
Short
149
Term
°C
Temperature
300
°F
No change in room temperature dynamic shear properties
following 4 hours conditioning at indicated temperature with 100
g/static load. (Represents minutes, hours in a process type
temperature exposure).
200
°F
Maximum temperature where tape supports at least 250 g load
per 0.5 in² in static shear for 10,000 minutes. (Represents
continuous exposure for days or weeks).
Resistance
Long
93
Term
°C
Temperature
Tolerance
Static Shear
Test Condition
1000 g
Room Temperature
500 g
66°C (150°F)
500 g
93°C (200°F)
Property: Static Shear
Method: ASTM D3654
Substrate: Stainless Steel
notes: Tested at various temperatures and gram loadings. 0.5 in² (3.23 cm²). Will hold listed weight for 10,000 minutes (approximately 7 days).
Available Sizes
Property
Values
Attribute Modi er
Standard Roll Length
32.9 m
36 yd
Minimum Available Width
6.4 mm
0.25 in
Maximum Available Width
1219 mm
48 in
Normal Slitting Tolerance
±0.79 mm
±1/32 in
Core Size
76.2 mm
3 in
ID
Room
Temperature
3M™ VHB™ Tape 4941
Available Sizes (continued)
Available Sizes:
Converted Parts
In addition to standard and custom roll sizes available from 3M through the distribution network, 3M™ VHB™ Tapes are also available in limitless shapes and sizes
through the 3M Converter network. For additional information, contact 3M Converter Markets at 1-800-223-7427 or on the web at www.3M.com/converter.
Special Considerations
Plasticized Vinyl – Plasticizers compounded in soft vinyl can migrate into adhesives and signi cantly change their performance characteristics. 3M™ VHB™ Tapes
4941 family has very good plasticizer resistance and adhesion to many vinyl formulations. Because of the wide variation in vinyl formulations, however, evaluation by
the user must be conducted with the speci c vinyl used to ensure that performance will be satisfactory over time. Problems related to plasticizer migration can often
be predicted by accelerated aging of assembled parts at 150°F (66°C) for one week).
3M™ VHB™ Tape 4941
UL746C Listings
Solvent and Fuel Resistance
Solvent Resistance:
3M™ VHB™ Tape 4941
Additional Typical Performance Characteristics
Property
Values
Method
Test Condition
Water Vapor Transmission
25.6 g/m²/24 hr
ASTM F1249
@ 38°C/100% RH
Shear Modulus
3 × 10^5 Pa
Poisson's Ratio
0.35
Coe cient of Thermal
Expansion
180 × 10^-6 m/m/°C
Values
Method
Test Condition
Dielectric Constant
2.29
ASTM D150
1 KHz, Room Temperature
Dielectric Constant
1.99
ASTM D150
1MHz, Room Temperature
Dissipation Factor
0.0245
ASTM D150
1 KHz, Room Temperature
Dissipation Factor
0.0374
ASTM D150
1MHz, Room Temperature
Dielectric Strength
14 V/μm
360 V/mil
Thermal Conductivity
0.08 W/m/K
0.5 (btu-in)/(h-ft²-°F)
Volume Resistivity
2.1 × 10^14 Ω-cm
ASTM D257
Room Temperature
Surface Resistivity
2.7 × 10^14 Ω/sq
ASTM D257
Room Temperature
100 × 10^-6 in/in/°F
Electrical and Thermal Properties
Property
ASTM D140
3M™ VHB™ Tape 4941
Design Considerations
Adhesion to the substrate is important in achieving bonding success. Adhesives must ow onto the substrate surfaces in order to achieve intimate contact area and
allow the molecular force of attraction to develop. The degree of ow of the adhesive on the substrate is largely determined by the surface energy of the substrate.
3M™ VHB™ 4941 family tapes bond well to high (HSE) and medium (MSE) surface energy materials. The image below shows typical materials in these categories.
Achieving good contact is also important. The necessary thickness of tape depends on the rigidity of substrates and their atness irregularity. While the 3M™ VHB™
Tapes will conform to a certain amount of irregularity, they will not ow to ll gaps between the materials. For bonding rigid materials with normal atness, consider
use of tapes with thickness of 45 mils (1.1 mm) or greater. As the substrate exibility increases thinner tapes can be considered.
Using the right amount of tape is important to handle the expected stresses. Because 3M™ VHB™ Tapes are viscoelastic by nature their strength and sti ness is a
function of the rate at which they are stressed. They behave stronger with relatively faster rate of stress load (dynamic stresses) and will tend to show creep behavior
with stress load acting over a long period of time (static stresses). As a general rule, for static loads, approximately four square inches of tape should be used for each
pound (57 cm² of tape per kg) of weight to be supported in order to prevent excessive creep. For dynamic loads a useful design factor is 12 lb/in2 (85 kPa) for most
dynamic stresses in general applications.
Allow for thermal expansion/contraction. 3M™ VHB™ Tapes can perform well in applications where two bonded surfaces may expand and contract di erentially.
Assuming good adhesion to the substrates, the tapes can typically tolerate di erential movement in the shear plane up to 3 times their thickness.
Bond Flexibility: While an advantage for many applications where allowing di erential movement is a bene t, the tape bonds are typically more exible than alternative
bonding methods. Suitable design modi cations or periodic use of rigid fasteners or adhesives may be needed if additional sti ness is required.
Performance in Severe Cold Temperature can be challenging. Applications which require performance at severe cold temperatures must be thoroughly evaluated by
the user if the intended use will subject the tape product to high impact stresses. A technical bulletin “3M™ VHB™ Tape Cold Temperature Performance” (70-07073991-0) is available for additional information.
3M™ VHB™ Tape 4941
Handling/Application Information
Application Techniques
Clean: Most substrates are best prepared by cleaning with a 50:50 mixture of isopropyl alcohol (IPA*) and water prior to applying 3M™ VHB™ Tapes.
Exceptions to the general procedure that may require additional surface preparation include:
• Heavy Oils: A degreaser or solvent-based cleaner may be required to remove heavy oil or grease from a surface and should be followed by cleaning with IPA/water.
• Abrasion: Abrading a surface, followed by cleaning with IPA/water, can remove heavy dirt or oxidation and can increase surface area to improve adhesion.
• Adhesion Promoters: Priming a surface can signi cantly improve initial and ultimate adhesion to many materials such as plastics and paints.
• Porous surfaces: Most porous and bered materials such as wood, particleboard, concrete, etc. need to be sealed to provide a uni ed surface.
• Unique Materials: Special surface preparation may be needed for glass and glass-like materials, copper and copper containing metals, and plastics or rubber that
contain components that migrate (e.g. plasticizers).
Refer to 3M Technical Bulletin “Surface Preparation for 3M™ VHB™ Tape Applications” for additional details and suggestions. (70-0704-8701-5)
*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.
Pressure: Bond strength is dependent upon the amount of adhesive-to-surface contact developed. Firm application pressure develops better adhesive contact and
helps improve bond strength. Typically, good surface contact can be attained by applying enough pressure to insure that the tape experiences approximately 15 psi
(100 kPa) pressure. Either roller or platen pressure can be used. Note that rigid surfaces may require 2 or 3 times that much pressure to make the tape experience 15
psi.
Temperature: Ideal application temperature range is 70°F to 100°F (21°C to 38°C). Pressure sensitive adhesives use viscous ow to achieve substrate contact area.
Minimum suggested application temperature for the 3M™ VHB™ Tape 4941 family is 60°F (15°C). Minimum application temperature does vary by 3M™ VHB™ tape
family and ranges from 32°F to 60°F (0°C to 15°C)
Note: Initial tape application to surfaces at temperatures below these suggested minimums is not recommended because the adhesive becomes too rm to adhere
readily. However, once properly applied, low temperature holding is generally satisfactory. To obtain good performance with all 3M™ VHB™ Tapes, it is important to
ensure that the surfaces are dry and free of condensed moisture.
Time: After application, the bond strength will increase as the adhesive ows onto the surface (also referred to as “wet out”). At room temperature approximately 50%
of ultimate bond strength will be achieved after 20 minutes, 90% after 24 hours and 100% after 72 hours. This ow is faster at higher temperatures and slower at lower
temperatures. Ultimate bond strength can be achieved more quickly (and in some cases bond strength can be increased) by exposure of the bond to elevated
temperatures (e.g. 150°F [66°C] for 1 hour). This can provide better adhesive wetout onto the substrates. Abrasion of the surfaces or the use of primers/ adhesion
promoters can also have the e ect of increasing bond strength and achieving ultimate bond strength more quickly.
3M™ VHB™ Tape 4941
Storage and Shelf Life
All 3M™ VHB™ Tapes have a shelf life of 24 months from date of manufacture when stored at 40°F to 100°F (4°C to 38°C) and 0-95% relative humidity. The optimum
storage conditions are 72°F (22°C) and 50% relative humidity.
Performance of tapes is not projected to change even after shelf life expires; however, 3M does suggest that 3M™ VHB™ Tapes are used prior to the shelf life date
whenever possible.
The manufacturing date is available on all 3M™ VHB™ Tapes as the lot number, typically marked on the core or on a label on the outer roll lap. The lot number,
typically a 4 digit code, is a Julian date (Y D D D). The rst digit refers to the year of manufacture, the last 3 digits refer to the days after January 1. Example: A lot
number of 7266 (or 17266) would translate to a date of manufacture of Sept. 23 (266th day of year) in 2017.
Industry Speci cations
UL 746C (File MH 17478)
UL GREENGUARD and UL GREENGUARD Gold Certi ed, contributing to LEED Credit
EN 45545 test report for details (ISO 5659-2, ISO 9239-1, ISO 5660-1, ISO 5658-2)
Trademarks
3M and VHB are trademarks of 3M Company.
References
Property
Values
3m.com Product Page
https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-VHBTape-4941?N=5002385+3293242237&rt=rud
Safety Data Sheet (SDS)
https://www.3m.com/3M/en_US/company-us/SDS-search/results/?
gsaAction=msdsSRA&msdsLocale=en_US&co=ptn&q=4941
Family Group
4919F
4936
4936F
4941
4941F
4926
4956
4956F
4979F
4991
4991B
Color
Black
Gray
Gray
Gray
Gray
Gray
Gray
Gray
Black
Gray
Black
Tape Thickness (mm)
0.6
0.6
0.6
1.1
1.1
0.4
1.6
1.6
1.6
2.3
2.3
Adhesive Type
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
MultiPurpose
Acrylic
Foam Type
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Conforma
ble Acrylic
Foam
Liner
PE Film
DK Paper
PE Film
DK Paper
PE Film
DK Paper
DK Paper
PE Film
PE Film
PE Film
PE Film
Liner Thickness (mm)
0.13
0.08
0.13
0.08
0.13
0.08
0.08
0.13
0.13
0.13
0.13
Liner Color
Red
(printed)
White
(printed)
Red
(printed)
White
(printed)
Red
White
(printed)
White
(printed)
Red
(printed)
Red
(printed)
Red
(printed)
Red
(printed)
ISO Statement
This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001 standards.
3M™ VHB™ Tape 4941
Information
Technical Information: The technical information, guidance, and other statements contained in this document or otherwise provided by 3M are based upon records,
tests, or experience that 3M believes to be reliable, but the accuracy, completeness, and representative nature of such information is not guaranteed. Such
information is intended for people with knowledge and technical skills su cient to assess and apply their own informed judgment to the information. No license under
any 3M or third party intellectual property rights is granted or implied with this information.
Product Selection and Use: Many factors beyond 3M’s control and uniquely within user’s knowledge and control can a ect the use and performance of a 3M product
in a particular application. As a result, customer is solely responsible for evaluating the product and determining whether it is appropriate and suitable for customer’s
application, including conducting a workplace hazard assessment and reviewing all applicable regulations and standards (e.g., OSHA, ANSI, etc.). Failure to properly
evaluate, select, and use a 3M product and appropriate safety products, or to meet all applicable safety regulations, may result in injury, sickness, death, and/or harm
to property.
Warranty, Limited Remedy, and Disclaimer: 3M warrants for 24 months from the date of 3M shipment that 3M™ VHB™ Tape will be free of defects in material and
manufacture. 3M MAKES NO OTHER WARRANTIES OR CONDITIONS, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OR
CONDITION OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR ARISING OUT OF A COURSE OF DEALING, CUSTOM, OR USAGE OF TRADE.
This 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 (except to the extent 3M approves and issues a speci c application warranty, for which the customer must
apply, receive 3M approval, and meet all applicable warranty and process requirements, the additional details, terms, and conditions of which are available from 3M).
If a 3M product does not conform to this warranty, then the sole and exclusive remedy is, at 3M’s option, replacement of the 3M product or refund of the purchase
price.
Limitation of Liability: Except for the limited remedy stated above, and except to the extent prohibited by law, 3M will not be liable for any loss or damage arising from
or related to the 3M product, whether direct, indirect, special, incidental, or consequential (including, but not limited to, lost pro ts or business opportunity),
regardless of the legal or equitable theory asserted, including, but not limited to, warranty, contract, negligence, or strict liability.
3M United States
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