• Description for 3M 77

    A fire retardant arc proofing tape designed to protect all types of electrical cables. Its unique formulation allows the manufacture of an unsupported elastomer that expands to provide a thick char buildup.

    *See Terms of Use Below

    Chemical Resistance Gases, Chemical Resistance: Acids, Chemical Resistance: Fluid Resistance: Resistant to Water, Sewage, Chemical Resistance: Fluid Resistance: Resistant to Salt water
    Application Type Protect from flames
    1 Part or 2 Part 1-Part
    Material Form Tape
    Substrate PVC, Polyethylene
    Industry To provide additional electrical insulation, Electrical cables, To arc proof high-energy power cables, To arc proof control cable when high energy power cables are present, Synthetic cable jackets, Control cables in manholes
    Manufacturer 3M
    Chemistry Heptane Carrier, Non-flammable: Fire-Retardant
    Cure Method Pressure Sensitive
    Color Black, White-Gray, White-Gray
    Arc Resistance (sec) Electric Arc Resistance
    Key Specifications UL 94, V-O
  • Technical Data for 3M 77

    • Chemical Resistance
      • Chemical Resistance : Fluid Resistance : Water Resistance - Resistant to Water, Resistant to Salt water
      • Chemical Resistance - Gases, Sewage
      • Chemical Resistance : Acid Resistance - Acids
    • Application Type
      • Fire Protection - Protect from flames
    • 1 Part or 2 Part
      • 1-Part
    • Material Form
      • Tape
    • Substrate
    • Industry
      • Electronics - To provide additional electrical insulation
      • Cable - Electrical cables, To arc proof high-energy power cables, To arc proof control cable when high energy power cables are present, Control cables in manholes, Synthetic cable jackets
      • Other - Vaults
    • Chemistry
      • Non-flammable : Flame Retardant - Fire-Retardant
      • Other - Heptane Carrier
    • Cure Method
      • Pressure Sensitive (min) - Pressure Sensitive
    • Color
      • Black
      • Gray - White-Gray
      • White - White-Gray
    • Key Specifications
      • UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association) - UL 94, V-O
    Bond Strength
    General Bond Strength (psi) 1,200 Test Method
    Material Resistance
    Flame Resistance flame resistance
    Arc Resistance (sec) Electric Arc Resistance
    UV Resistance UV resistance
    Dielectric Strength (V/mil) Electrical insulation, > 10,000 (V) Test Method
    Thermal Conductivity (W/m°K) 0.25 Test Method
    Elongation (%) 150, 130, 90 Test Method
    Flexibility Flexibility
    Business Information
    Shelf Life Details This product has a 5-year shelf life from date of manufacture when stored in a humidity controlled storage (10°C/50°F to 27°C/80°F and <75% relative humidity).
    Shelf Life Temperature (°F) 50 to 81
    Shelf Life Type From date of manufacture.
    Shelf Life (mon) 61
    Not Good For
    Don't Use For metallic cable sheaths
  • Best Practices for 3M 77

    *See Terms of Use Below

    1. Application

      Wrap Scotch® Tape 77 Black or 77 White in half-lapped layers. The tape should be stretched slightly to obtain a snug, virtually wrinkle-free wrap which conforms to the cable. Overlap the last 6 inches of protected cable when starting a new roll of tape.

      Since the Scotch® Tape 77 Series is not adhesive coated, it must be held in place after wrapping with bands of Scotch® Glass Cloth Electrical Tape 69. The most effective and economical way to hold either of these tapes in place is by banding (2 complete wraps) the first and last applied wrap.

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General Bond Strength Test Methods
General Bond Strength Test Temperature Test Method
1,200 psi 23°C ASTM D-1000
Dielectric Strength Test Methods
Dielectric Strength Test Method
Electrical insulation
> 10,000 (V) ASTM D-1000
Thermal Conductivity Test Methods
Thermal Conductivity Temperature Test Method
0.25 W/m°K 23°C ASTM C-518
Elongation Test Methods
Elongation Test Method
150 % ASTM D-1000, 23 (°C)
130 % ASTM D-1000, -12 (°C)
90 % ASTM D-1000, -18 (°C)