Application Type Bond Material Form Tape Substrate Glass, Metal, High surface energy plastics, Plastics, Stainless Steel, Aluminum, Copper Industry Many exterior bonding applications, General purpose, Rivets Manufacturer 3M Chemistry Acrylic Cure Method Pressure Sensitive Cure Temperature (°C) 20 to 25 Room temperature, 20 to 25 Room temperature, 20 to 25 Room temperature Cure Time (min) >20, >1,440, >4,320 Color White, Green Relative Solvent Resistance Chemical Resistance: Excellent solvent resistance High Temperature Resistance (°C) 93, 121 Other Resistance Resistance to plasticizer migration Durability Outstanding durability Density (g/cm³) 0.721 Key Specifications UL746C recognition Tape Backing/Carrier Acrylic Foam
Technical Data for 3M VHB Tape 4618
- Adhesive - Bond
- Rivet - Rivets
- Industrial - Many interior bonding applications, Other permanent fasteners, Spot welds
- Industrial Exterior - Many exterior bonding applications
- General Purpose
- Other - Multi purpose
- Roll - Roller
- Other - Platen pressure
- Pressure Sensitive (min) - Pressure Sensitive
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL746C recognition
- Acrylic Foam
Application Temperature (°F) 70 to 100 Cure Temperature (°C) 20 to 25 Room temperature, 20 to 25 Room temperature, 20 to 25 Room temperature Test Method Cure Time (min) >20, >1,440, >4,320 Test Method
General Bond Strength (psi) High Peel Strength (piw) High, 17 (lb/in) Test Method Shear Strength (psi) High, 80, 1000 (grams), 250 (grams), 250 (grams) Test Method Tensile Strength (psi) High, 85 Test Method
Total Thickness (mil) 25 Double Sided Double sided
High Temperature Resistance (°C) 93, 121 Moisture/Humidity Resistance Excellent moisture resistance Other Resistance Resistance to plasticizer migration
Durability Outstanding durability Flexibility Flexible
Coefficient of Thermal Expansion (CTE) 1e-4 (in/in/°F), 1.8e-4(mm/mm/°C) Density (g/cm³) 0.721
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. Shelf Life Temperature (°F) 40 to 100 Shelf Life Type From date of shipment Shelf Life (mon) 24
Best Practices for 3M VHB Tape 4618
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: 50°F (10°C): 3M™ VHB™ Tapes 4950, 4910, 4611, 4622 families.
60°F (15°C): 3M™ VHB™ Tape 4945family.
32°F (0°C): 3M™ VHB™ Tape LSE or 4951 family (Note: Surface must be frost free).
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.
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. Abrasion is not suggested with 3M™ VHB™ Tapes 4932 and 4952.
Adhesion Promoters: Priming a surface can significantly improve initial and ultimate adhesion to many materials such as plastics and paints.
Porous surfaces: Most porous and fibered materials such as wood, particleboard, concrete, etc. need to be sealed to provide a unified 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).
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.
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Cure Time Test Methods
|Cure Time||Test Method|
|>20 min||Approximately 50% of ultimate bond strength|
Cure Temperature Test Methods
|Cure Temperature||Cure Time Test Method|
|20 to 25°C Room temperature||Approximately 50% of ultimate bond strength|
|20 to 25°C Room temperature||90%|
|20 to 25°C Room temperature||100%|
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||20 to 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.|
|1000 (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.|
|250 (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.|
|250 (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|
|85 psi||4,320 min||Aluminum||20 to 25°C||(T-Block Tensile) - 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|
|17 (lb/in)||90° Peel Adhesion||4,320 min||Stainless steel||20 to 25°C Room temperature||Based onASTM D3330 -Tostainless steel,room temperature, jaw speed 12 in/min (304.8 mm/min).Average force to remove is measured. 72 hour dwell.|