Common materials include PE, PVC, PVDF, LSZH, Plenum, and Riser. While most outer sheath materials possess good flame-retardant properties, the material alone does not determine the fire resistance of the cable. Its structure is mainly composed of cable core, longitudinal covering a layer of two-sided synthetic mica tape outside cable core, inner sheath packed with ceramic sheathing. Optical fiber cables are generally composed of optical fiber cores, cladding, coatings, reinforcing elements, and outer sheaths. Depending. Our fire resistant/fire survival cables feature a steel wire/steel wire braiding/corrugated steel tape armour to provide mechanical strength. Optical cables used in vital communication and emergency systems need to be operational during fires. The outer sheath is made from black UV-stabilised and. rial environments.