Abstract: A dielectric system for coaxial electrical conductors is provided. The dielectric system separates an inner and an outer conductor and is composed of a first layer of cellular polyparabanic acid. This layer directly contacts and provides a continuous skin circumferentially surrounding the inner conductor along its length. A second layer, consisting of a crosslinkable polymeric lacquer which provides a continuous skin enclosing the first layer is also provided. The dielectric system is used in coax cables.

Abstract: An insulated electrical conductor is provided that exhibits excellent physical, electrical and chemical protection for wire and cable and is particularly suitable for use in aircraft applications. The electrical conductor is insulated with (A) a film selected from ethylene tetrafluoroethylene copolymer film and fluorinated ethylene-propylene (FEP) copolymer coated polyimide film and (B) a topcoat insulation system comprising (a) a first layer of polyimide, (b) a second layer of polyvinylidene fluoride, and (c) a third layer of crosslinked acrylic polymer.