Electrically Insulating Materials

Electrically insulating materials are chosen to block the flow of electricity. Correctly chosen materials can increase the efficiency or extend the life of your unit, reduce failures and repairs, and provide an added safety margin against unforeseen electrical stress situations in your electrical equipment.

Material Types Available

  • Fibre/Paper: Fishpaper, vulcanized fibre, fibreboard, rag fibre, aramid paper
  • Industrial Laminates: canvas, fiberglass, nylon, carbon fibre, epoxy, polyimide, polyester
  • Plastics: polypropylene, polyimide, polycarbonate, FEP teflon
  • Tapes: polyester, polyimide, teflon

Things to Consider

When choosing an electrically insulating material, consider the following:

  • Flame Resistance
  • Dielectric Strength
  • Temperature Range
  • Moisture Resistance
  • Puncture Resistance
  • Forming Capabilities
  • Thickness
  UL 94 FR Rating High Temperature Range Dielectric Strength
Fibre / Paper
Unbleached Kraft (VHR 115) UL 94 HB 230° F 250 V/Mil
Aramid Fibre (Nomex 410) UL 94 V-0 430° F (continuous) 430 V/Mil
Vulcanized Fibre (Fishpaper) UL 94 HB 239° F 400 V/Mil
Industrial Laminates
Epoxy Glass (FR4) UL 94 V-0 (approx.) 265° F 840 V/Mil
Polypropylene (Formex) UL 94 V-0 203-240° F 1800-2200 V/Mil
Polyimide (Kapton Film) UL 94 V-0 390-428° F (continuous) 6,000 V/Mil
Polycarbonate (Lexan) UL 94 V-0 185° F (continuous) 17,000 V/Mil
Teflon (FEP) UL 94 V-0 400° F (continuous) 6,500 V/Mil