1. cable protection pipe. 2. Good toughness. 3.Good performances of waterproof. 4.Good corrosion resistance. HDPE silicon core pipe is a new type of ... extruders. The product is widely used in protecting sleeve pipe for optical cable of express way, rail way, telecom communication system, and ... Spec. include 21,25,32,40,50,60mm. color optic cable protection pipe