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.

*See Terms of Use Below

Application Type	Insulate
1 Part or 2 Part	1 Part
Material Form	Tape
Substrate	Polyethylene, PVC
Industry	Electrical cables, To provide additional electrical insulation, 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, 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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Technical Data for 3M 77

*See Terms of Use Below

Overview

Application Type
- Other - Insulate
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
Material Form
- Tape
Substrate
- Polyethylene (LDPE, HDPE) - Polyethylene
- Polyvinyl chloride (PVC) - PVC
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
- Other - Fire-Retardant, 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

Specifications

Bond Strength

General Bond Strength (psi)	1,200	Test Method

Material Resistance

Flame Resistance	flame resistance
Arc Resistance (sec)	Electric Arc Resistance
Chemical Resistance	water, salt, acids, gases, sewage
UV Resistance	UV resistance

Conductivity

Dielectric Strength (V/mil)	Electrical insulation, > 10,000 (V)	Test Method
Thermal Conductivity (W/m°K)	0.25	Test Method

Hardness

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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*See Terms of Use Below

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