self-regulating heating cables good heating system CE ,ROHS, GOST approved best heating cable Cable structure:1. Copper-core wire: 7×0.50, 7×0.32, 19×0.412. Conductive plastic layer: common PTC, fire-retardant PTC, fluorin-contained PTC3. Insulation layer: modified polyolefin, fire-retardant polyolefin, fluorin-contained polyolefin, fluorin material4. Shielding layer: soft round tinning copper ...