A New Construction of Halogen-Free Flame Retardant Insulated Wire with Double Layers
FURUKAWA ELECTRIC CO LTD TOKYO (JAPAN)
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To protect peripheral equipment from corrosive gaseous HC1 and prevent formation of black smoke and toxic gases during combustion of halogen compounds, a few halogen-free materials with highly flame retardant properties have so far been studied for cable use in nuclear power plants, underground railways and ships. For internal wiring in appliances, however, halogen-free insulated wires that pass the flame test of UL Std.62 VW-1 have not been developed. Flame retardant XL-PVC or XL-FRPE insulated wires now in use produce halogen gases when the wires are used at high temperature for a long term, thereby corroding the periphery equipment. Amplifier relay circuits, which are liable to excessive temperature rise, pose an especially difficult problem.