FLAME RETARDANT DUAL INSULATION DESIGN AND CABLE CONSTRUCTION FOR PLENUM APPLICATIONS

摘要

A flame and smoke retardant dual insulation design for insulated conductors in a telecommunication cable is disclosed. The insulation comprises an elongate substantially cylindrical fluoro-polymer outer layer and an under layer interposed between the conductor and the outer layer. The under layer includes a metallocene type polyolefin having PTFE micro-particles, a halogen type flame retardant package and clay based nanocomposite type particles, or any combination thereof. This insulation design has the advantage of reducing the thickness of the fluoro-polymer layer.