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Description for 3M 4921
Translucent, closed-cell elastomeric foam carrier • Thin bond lineChemical Resistance Chemical Resistance: Hydrocarbon solvent Application Type Bond, Hold 1 Part or 2 Part 1-Part Material Form Tape, Elastomeric Foam Substrate Metal, Elastomers, Wood, Foam, Plastics Industry Nameplates, Signs Manufacturer 3M Chemistry Acrylic, Elastomeric Foam Cure Method Pressure Sensitive Application Temperature (°F) 70 to 100 Color Natural High Temperature Resistance (°C) 66, 93 Density (g/cm³) 0.510 Key Specifications TSCA -
Technical Data for 3M 4921
Overview
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Chemical Resistance
- Chemical Resistance : Relative Solvent Resistance - Hydrocarbon solvent
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Application Type
- Adhesive - Bond, Hold
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1 Part or 2 Part
- 1-Part
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Material Form
- Elastomer - Elastomeric Foam
- Tape
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Industry
- Sign - Signs
- Industrial - Nameplates
- Printing and Graphics - Nameplates
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Chemistry
- Acrylic
- Other - Elastomeric Foam
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Application Method
- Dispenser - Application equipment
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Cure Method
- Pressure Sensitive (min) - Pressure Sensitive
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Color
- Other - Natural
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Key Specifications
- TSCA (Toxic Substances Control Act) - TSCA
Specifications
Cure Specs
Application Temperature (°F) 70 to 100 Bond Strength
Shear Strength (psi) 1000 (gram), 1000 (gram), 500 (gram) Test Method Tensile Strength (psi) 95, 600 Test Method Material Resistance
UV Resistance UV resistance High Temperature Resistance (°C) 66, 93 Conductivity
Dielectric Strength (V/mil) 400 to 500 Thermal Conductivity (W/m°K) 0.11 Hardness
Elongation (%) 800 Flexibility Elastomeric, Firm Other Properties
Density (g/cm³) 0.510 Business Information
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 -
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Best Practices for 3M 4921
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Surface Preparation
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.
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Application
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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Comparable Materials for 3M 4921
Spec Engine® Results
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VHB Tape 4905(3M)• Double sided foam tape • Clear color • Ideal for use in many interior bonding applications • Ideal for use in many exterior bonding applications • Excellent solvent resistance • High tensile strength • High shear adhesion • Outstanding durability
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7952MP(3M)
Excellent resistance to harsh environments, this adhesive can withstand splashes of organic solvents, weak acids and bases and salt water, cleaning solutions, germicidals, disinfectants, oils, etc. In addition, it performs well after exposure to humidity and hot/cold cycles.
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3M Adhesive Transfer Tape 9668MP(3M)
Excellent resistance to harsh environments, this adhesive can withstand splashes of organic solvents, weak acids and bases and salt water, cleaning solutions, germicidals, disinfectants, oils, etc. In addition, it performs well after exposure to humidity and hot/cold cycles.
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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) |
| 600 psi |
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. |
