3M 77

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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.

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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

Best Practices for 3M 77

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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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Technical Data

Overview

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Specifications

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Best Practices

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