Insulation Type: PEK


Trade Names(the following are common tradenames used for PEK insulation)
  • Stilan


Aircraft on which PEK has been used/found
  • Boeing 747 (1975 - 1979)
  • DC-10 (1974 - 1977)

*Note: Some of the older aircraft types of insulation may have replaced by the original wire. The listings of aircraft are not complete, especially with those special uses, e.g., engine areas, electronic boxes, etc.


Mil Specs and other Standards using PEK
  • BMS 13-42 C & D (Boeing)
  • MIL-W-81044/20
  • MIL-W-81044/21
  • MIL-W-81044/22
  • MIL-W-81044/23
  • MIL-W-81044/24
  • MIL-W-81044/25
  • MIL-W-81044/26
  • MIL-W-81044/27
  • MIL-W-81044/28
  • MIL-W-81044/29

Advantages: Relatively light - 4.7 pounds per 1000 feet (6.9 kg/km) for AWG 20 gauge wire Moderate thickness – 59 mils (1.50 mm) for AWG 20 gauge wire


Disadvantages: Variable quality Installed for a relatively short time period Some claims that the material was susceptible to attack by many fluids Stress cracking suggested

Other Information: Extent that this insulation probably has been removed from service is not known


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