• Description for 3M 4921

    Translucent, closed-cell elastomeric foam carrier • Thin bond line

    *See Terms of Use Below

    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

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Elastomer - Elastomeric Foam
      • Tape
    • Substrate
    • Industry
      • Sign - Signs
      • Industrial - Nameplates
      • Printing and Graphics - Nameplates
    • Chemistry
    • Application Method
      • Dispenser - Application equipment
    • Cure Method
      • Pressure Sensitive (min) - Pressure Sensitive
    • Color
      • Other - Natural
    • 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
  • Best Practices for 3M 4921

    *See Terms of Use Below

    1. 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.

    2. 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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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)
600 psi