AN EVALUATION OF HEAT STABILIZED, FLAME-RETARDED, CROSS-LINKED POLYOLEFINS FOR ELECTRONIC WIRE AND CABLE APPLICATIONS

A new electronic hookup wire was developed for service over a wide temperature range based upon a heat stabilized flame retarded cross-linked polyolefin insulation. Cross-linking is accomplished by exposure of the wire to massive doses of high energy electron radiation. Previous limitations of low softening temperature, poor corrosion characteristics with conventional flame retardants, poor oxidation resistance, and lack of toughness and abrasion resistance that retarded the use of polyethylene as thin wall hookup wire insulation have been eliminated. A strong elastomeric three dimensional network give substantial strength at elevated temperatures along with a remarkable oxidation resistance giving extended high temperature service even while under severe stress. A new flame retarded system has eliminated any corrosion problems. The deformation of the insulation by a small radius under high unit stress is remarkable good and indicative of the ability to withstand rugged handling and assembly practices. Additional advantages of this new hookup wire include outstanding radiation resistance, chemical resistance and abrasive resistance. The wire is a light weight, relatively low cost product for service in difficult environmental situations.