HIGH TEMPERATURE INSULATING TAPE AND WIRE OR CABLE SHEATHED THEREWITH

摘要

A composite insulating tape (20) comprises a laminate or co-extrusion of at least two layers, including an insulating first layer (24) of a polymer matrix in which mica particles are dispersed and a second layer (26) of a polymer containing aromatic and/or heterocyclic rings and having a melting point of at least 350°C and a glass transition temperature of at least 150°C. The tape can be used to form a multilayer coating on a conductor (10) such as an electric wire. An outer protective layer (28) of a fluoropolymer such as PTFE may be applied around the wrapped tape, by wrapping or extrusion.