atpolymer com All or part of the insulation layer, sheath, outer sheath, and auxiliary materials (taping and filling) of halogen-free low-smoke flame-retardant cables are halogen-free cross-linked polyethylene (XLPE) flame-retardant materials, not only Has better... moreAll or part of the insulation layer, sheath, outer sheath, and auxiliary materials (taping and filling) of halogen-free low-smoke flame-retardant cables are halogen-free cross-linked polyethylene (XLPE) flame-retardant materials, not only Has better flame retardant properties, and no halogen acid gas is released when the cable is burned.