THERMALLY RESISTANT CROSSLINKED WIRE

The present invention provides a thermally resistant crosslinked wire in which a bromine-based flame retardant and a resin composition containing magnesium hydroxide are used, wherein flame retardancy and flexibility are ensured, and battery fluid resistance and abrasion resistance are excellent. The thermally resistant crosslinked wire comprises a high-density polyethylene, low-density polyethylene, an ethylenic copolymer, a resin made of an ethylenic copolymer denatured by an unsaturated carboxylic an-hydroxide, a bromine-based flame retardant, and magnesium hydroxide. The thermally resistant crosslinked wire is obtained by forming a coating layer using the resin composition, and crosslinking the coating layer, with which the periphery of a conductor is coated. In the resin composition, the total blending amount of the bromine-based flame retardant and magnesium hydroxide with respect to 100 parts by mass of the resin is in a range of 30 parts by mass to 55 parts by mass. The type D durometer harness (HDD) of the resin composition according to JIS K 7215 is in a range of 56 to 64. The specific gravity obtained using the water displacement method according to JIS K 7112 is in a range of 1.14 to 1.25.