Abstract: An electrical wire or cable has a metallic conductor surrounded by at least one layer of polyimide winding tape. Over the insulator is at least one layer of polytetrafluoroethylene winding tape having a planoconvex cross section. The outermost layer of the polyimide winding tape has a bond with the polytetrafluoroethylene winding tape. The resulting construction has a smooth surface that can be marked.

Abstract: A high-frequency coaxial cable has a multi-layer insulation made of polymeric materials surrounding a central conductor and having an electrical shielding enclosing the insulation. The individual layers of the insulation are of fluoropolymers, with at least a first layer (2) that encloses the central conductor (1) being made of a fluoropolymer capable of being formed from a melt and an outer second layer (3) being made of a fluoropolymer not formable from a melt. In this cable, the second layer (3) is porous and is inter-engagedly connected with the surrounding shield (4).

Abstract: Extrudable halogen-free mixture comprising 95-5 weight-% polyetherimide polymer with an elastic modulus greater than 2000 MPa and 5-95 weight-% flexible siloxane-polyetherimide copolymer with an elastic modulus of less than 2000 MPa. Electrical cable or wiring insulated with the extrudable halogen-free mixture comprising 60-90 weight-% of a polyetherimide polymer with an elastic modulus greater than 2000 MPa and 40-10 weight-% of a flexible siloxane-polyetherimide copolymer with an elastic modulus of less than 1000 MPa. Electrical or optical cable or tubing sheathed with the extrudable halogen-free mixture comprising 40-10 weight-% of a polyetherimide polymer with an elastic modulus greater than 2000 MPa and 60-90 weight-% of a flexible siloxane-polyetherimide copolymer with an elastic modulus of less than 1000 MPa.

Abstract: Recesses or openings (4) are arranged in a wall of an elongated tubular covering (3) made of resinous plastics that are resistant to temperature stresses and/or aggressive media; these openings are covered from the outside by a microporous layer (5) made of a fluoropolymer that is resistant to high temperatures.