Application Type Bond Material Form Tape Substrate Aluminum, Acrylic paint, Phenolic, Glass, Metal, ABS, Polyimide, Vinyl, Polycarbonate, Polyester paint, Polyurethane paint, UnPlasticized PVC, Galvanized Steel, Stainless Steel, Galvanized Steel, Plastic Industry Many exterior bonding applications Manufacturer 3M Chemistry Acrylic Cure Method Pressure sensitive Color White Relative Solvent Resistance Chemical Resistance: Excellent solvent resistance High Temperature Resistance (°C) 149, 93, 110, 90, 75 Low Temperature Resistance (°C) -35 Durability Excellent durability Density (g/cm³) 0.800 Key Specifications UL 746C Tape Backing/Carrier Acrylic Foam
Technical Data for 3M 4946
- Adhesive - Bond
- Galvanized - Galvanized Steel
- Plastic - ABS
- Acrylic (PMMA) - Acrylic paint
- Polyimide (PI) - Polyimide
- Polyurethane - Polyurethane paint
- Polyvinyl chloride (PVC) - UnPlasticized PVC
- Polyester - Polyester paint
- Galvanized Steel
- Stainless Steel
- Other - Alkyd enamel, Paint, Specific materials, Broad range of materials
- Industrial - Many interior bonding applications
- Industrial Exterior - Many exterior bonding applications
- Dispenser - Application equipment
- Roll - Roller
- Pressure Sensitive (min) - Pressure sensitive
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL 746C
- Acrylic Foam
Application Temperature (°F) 59, 70 to 100
Peel Strength (piw) High, 25 (lb/in) Test Method Shear Strength (psi) High, 80, 1500 (grams), 500 (grams), 500 (grams) Test Method Tensile Strength (psi) High, 140 Test Method
Double Sided Double Sided Total Thickness (mil) 45
High Temperature Resistance (°C) 149, 93, 110, 90, 75 Test Method Low Temperature Resistance (°C) -35 Moisture/Humidity Resistance Excellent moisture resistance
Durability Excellent durability Flexibility Firm
Coefficient of Thermal Expansion (CTE) 1e-4 (in./ in/°F), 1.8e-4 (mm/mm /°C) Density (g/cm³) 0.800
Shelf Life Details 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. Shelf Life Temperature (°F) 40 to 100 Shelf Life Type from date of shipment Shelf Life (mon) 24
Best Practices for 3M 4946
Most substrates are best prepared by cleaning with a 50:50 mixture of isopropyl alcohol (IPA*) and water prior to applying 3M™ VHB™ Tapes.
See Vendor Technical Data Sheet for more info.
To obtain good performance with all 3M™ VHB™ Tapes, it is important to ensure that the surfaces are dry and free of condensed moisture.
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.
Ideal application temperature range is 70°F to 100°F (21°C to 38°C). Pressure sensitive adhesives use viscous flow to achieve substrate contact area. Minimum suggested application temperatures:60°F (15°C): 3M™ VHB™ Tapes 4941, 4945 families.
Note: Initial tape application to surfaces at temperatures below these suggested minimums is not recommended because the adhesive becomes too firm to adhere readily. However, once properly applied, low temperature holding is generally satisfactory.
After application, the bond strength will increase as the adhesive flows 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 flow 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 effect of increasing bond strength and achieving ultimate bond strength more quickly.
Comparable Materials for 3M 4946
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Shear Strength Test Methods
|Shear Strength||Type||Cure Time||Substrate||Test Time||Test Temperature||Test Method|
|80 psi||Dynamic overlap shear strength||4,320 min||Stainless steel||25°C||ASTM D-1002 - To stainless steel, room temperature, 1 in2 (6.45 cm2), jaw speed 0.5 in/min (12.7 mm/min.) Peak force to separate is measured. 72 hour dwell.|
|1500 (grams)||Static shear strength||Stainless steel||600,000 sec||22°C||ASTM D3654 - To stainless steel, tested at various temperatures and gram loadings. 0.5 in2 (3.22 cm2). Will hold listed weight for 10,000 minutes (approximately 7 days). Conversion: 1500 g/0.5 in2 equals 6.6 lb/in2, 500 g/0.5 in2 = 2.2 lb/in2.|
|500 (grams)||Static shear strength||Stainless steel||600,000 sec||66°C||ASTM D3654 - To stainless steel, tested at various temperatures and gram loadings. 0.5 in2 (3.22 cm2). Will hold listed weight for 10,000 minutes (approximately 7 days). Conversion: 1500 g/0.5 in2 equals 6.6 lb/in2, 500 g/0.5 in2 = 2.2 lb/in2.|
|500 (grams)||Static shear strength||Stainless steel||600,000 sec||93°C||ASTM D3654 - To stainless steel, tested at various temperatures and gram loadings. 0.5 in2 (3.22 cm2). Will hold listed weight for 10,000 minutes (approximately 7 days). Conversion: 1500 g/0.5 in2 equals 6.6 lb/in2, 500 g/0.5 in2 = 2.2 lb/in2.|
Tensile Strength Test Methods
|Tensile Strength||Cure Time||Substrate||Test Temperature||Test Method|
|140 psi||4,320 min||Aluminum||ASTM D-897 - To aluminum, room temperature, 1 in2 (6.45 cm2), jaw speed 2 in/min (50 mm/min.) Peak force to separate is measured. 72 hour dwell.|
Peel Strength Test Methods
|Peel Strength||Type||Cure Time||Substrate||Test Temperature||Test Method|
|25 (lb/in)||90° Peel strength||4,320 min||Stainless steel||25°C||Based on ASTM D3330 -To stainless steel, room temperature, jaw speed 12 in/min (305 mm/min). Average force to remove is measured. 72 hour dwell.|
High Temperature Resistance Test Methods
|High Temperature Resistance||Test Method|
|149°C||Short Term Temperature Tolerance - 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).|
|93°C||Long Term Temperature Tolerance - 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)|