Application Type Bond 1 Part or 2 Part 1 Part Material Form Tape Substrate Glass, Metal, High surface energy plastics, Stainless Steel, Aluminum Industry Many exterior bonding applications, General purpose Manufacturer 3M Chemistry Acrylic Cure Method Pressure Sensitive Color White, Green Relative Solvent Resistance Chemical Resistance: Excellent solvent resistance High Temperature Resistance (°C) 93, 121 Other Resistance Plasticizer migration resistance Density (g/cm³) 0.720 Key Specifications UL746C recognition Tape Backing/Carrier Acrylic Foam
Technical Data for 3M 4618
- Adhesive - Bond
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Industrial - Many interior bonding applications
- Industrial Exterior - Many exterior bonding applications
- General Purpose
- Other - Multi purpose
- 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
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
High Temperature Resistance (°C) 93, 121 Moisture/Humidity Resistance Excellent moisture resistance Other Resistance Plasticizer migration resistance
Coefficient of Thermal Expansion (CTE) 1e-4 (in/in/°F), 1.8e-4(mm/mm/°C) Density (g/cm³) 0.720
Shelf Life Details All 3M™ VHB™ Tapes have a shelf life of 24 months from date of shipment 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 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.
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.
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.
Comparable Materials for 3M 4618
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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||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 Strength||4,320 min||stainless steel||20 to 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.|