Application Type Bond, Hold 1 Part or 2 Part 1 Part Material Form Tape, Elastomeric Foam Substrate Foam, Metal, Elastomers, Wood, Plastics Industry Nameplates, Signs Manufacturer 3M Chemistry Elastomeric Foam, Acrylic Cure Method Pressure Sensitive Color Natural Relative Solvent Resistance Chemical Resistance: Hydrocarbon solvent High Temperature Resistance (°C) 66, 93 Density (g/cm³) 0.510 Key Specifications TSCA
Technical Data for 3M 4921
- Adhesive - Bond, Hold
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Elastomer - Elastomeric Foam
- Sign - Signs
- Industrial - Nameplates
- Printing and Graphics - Nameplates
- Other - Elastomeric Foam
- Dispenser - Application equipment
- Pressure Sensitive (min) - Pressure Sensitive
- Other - Natural
- TSCA (Toxic Substances Control Act) - TSCA
Application Temperature (°F) 70 to 100
Shear Strength (psi) 1000 (gram), 1000 (gram), 500 (gram) Test Method Tensile Strength (psi) 95, 600 Test Method
UV Resistance UV resistance High Temperature Resistance (°C) 66, 93
Dielectric Strength (V/mil) 400 to 500 Thermal Conductivity (W/m°K) 0.11
Elongation (%) 800 Flexibility Elastomeric, Firm
Density (g/cm³) 0.510
Shelf Life Details Store in original cartons at 70°F (21°C) and 50% relative humidity.;If stored under proper conditions, products retain their performance and properties for 24 months from date of manufacture. If the products have been exposed to severe weather conditions, we suggest to precondition the products at the above storage conditions for at least 24 hours before using them. Shelf Life Temperature (°F) 70 Shelf Life Type From date of manufacture Shelf Life (mon) 24
Best Practices for 3M 4921
To obtain optimum adhesion, the bonding surfaces must be clean, dry and well unified. Typical surface cleaning solvents are isopropyl alcohol and water (rubbing alcohol) or heptane. Note: Be sure to follow manufacturer’s safety precautions and directions for use when using solvents. These cleaning recommendations may not be compliant with the rules of certain Air Quality Management Districts in California
consult applicable rules before use.
Bond strength is dependent upon the amount of adhesive-to-surface contact developed. Firm application pressure helps develop better adhesive contact and improve bond strength.
Ideal tape application temperature range is 70°F to 100°F (21°C to 38°C). Initial tape application to surfaces at temperatures below 50°F (10°C) is not recommended because the adhesive becomes too firm to adhere readily. However, once properly applied, low temperature holding is generally satisfactory.
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Shear Strength Test Methods
|Shear Strength||Type||Test Temperature||Test Method|
|1000 (gram)||Static shear strength||22°C||Measured at various temperature & gram loadings. (1/2 sq. in.overlap). Will hold listed weight for 100 hrs.|
|1000 (gram)||Static shear strength||49°C||Measured at various temperature & gram loadings. (1/2 sq. in.overlap). Will hold listed weight for 100 hrs.|
|500 (gram)||Static shear strength||66°C||Measured at various temperature & gram loadings. (1/2 sq. in.overlap). Will hold listed weight for 100 hrs.|
Tensile Strength Test Methods
|Tensile Strength||Test Method|
|95 psi||(“T” Block) 1 in.2 (6.45 cm2) Jaw Speed 2 in/min (50 mm/min)|