The outer sheath of the optical fiber cable is divided into different material types., LSZH, Plenum . Non-Metallic Called Flat GRP or Flat FRP On the Cable Core Application of Armor Made of Material This method is generally used in fiber optic cables that do not contain metal elements. In this method, a special non-metallic material called flat GRP (Glass Reinforced Plastic) or flat FRP (Fiber. Fiber optic cables are designed to provide high-speed, no-signal-loss, and EMI-free communication in telecommunication, powergrid, datacenter, broadband, and industrial applications. At the same time, it must have. Performance has a major impact.