• 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

    Application Type Insulate
    1 Part or 2 Part 1 Part
    Material Form Tape
    Substrate Plastic: polyethylene, PVC
    Industry electrical cables, accessories, To arc proof high-energy power cables where exposed to failures of other high-energy cables.(Any cables within 18 inches are considered to be exposed), To arc proof control cable when high energy power cables are present, Provide additional electrical insulation, thus reducing possibilities of transferred arcs, All high-energy cable, important communication and control cables in manholes, vaults, on open cable trays or other exposed locations where threat of communicated fault can occur
    Manufacturer 3M
    Chemistry Heptane Carrier, Fire-Retardant
    Cure Method Pressure Sensitive
    Color Black, White-Gray, White-Gray
    Arc Resistance (sec) Electric Arc Resistance
    Chemical Resistance water, salt, acids, gases, sewage
    Key Specifications UL 94, V-O
  • Technical Data

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  • Best Practices

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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)