1. cable pipe. 2. Good toughness. 3.Good performances of waterproof. 4.Good corrosion resistance. 5.fibre optic pipe. HDPE silicon core pipe ... product is widely used in protecting sleeve pipe for optical cable of express way, rail way, telecom communication system, and is ... easy.Its Spec. include 21,25,32,40,50,60mm. Fibre optic cable protection pipes