Electrical or optical cable insulated with synthetic material and comprising a flame resistant inner mantle

摘要

1. Multi-strand synthetic resin-insulated and synthetic resin-coated electrical or optical cable comprising an extruded inner sheath which is made of a halogen-free polymer containing additives, arranged between the twisted strands and the outer sheath, characterised in that the polymeric material of the inner sheath consists of an ethylene-vinyl acetate copolymer and contains as additives : a) a filler having a large number of esterifiable hydroxyl groups in an amount of 10 to 50% by weight, b) a catalyst which splits off acid on combustion also in an amount of 10 to 50% by weight, and c) a nitrogenous propellant for expanding the inner sheath under the influence of heat in an amount of 1 to 20% by weight.