MIL-DTL-81381C, DETAIL SPECIFICATION, WIRE, ELECTRIC, POLYIMIDE-INSULATED, COPPER OR COPPER ALLOY (26 AUG 2005) [SUPERSEDING MIL-W-81381A]., This specification covers polyimide-insulated single conductor electric wires made with tin-coated, silver-coated, or nickel-coated conductors of copper or copper alloy as specified in the applicable specification sheet. The polyimide insulation may be used alone or in combination with other insulation materials.