Silicon core pipe is a new type of composite pipe with silicone gel solid lubricant in the inner wall, with good sealing performance, chemical corrosion resistance, low engineering cost, widely used in highways, railways and other optical cable communication network system. HDPE silicone core pipe is a new type of composite pipe with silicone gel solid lubricant on the inner wall, referred to as silicone pipe. By three plastic extruder synchronous extrusion composite, the main raw material for high-density polyethylene, the core layer for the lowest coefficient of friction of the solid lubricant silicone gel. Widely used in optical cable communication network system.