PLB HDPE Duct is formed by co extrusion technique and are mainly used for laying optical fiber cable. It is made by using Permanently Lubricated Ducts is High Density Poly Ethylene. It is used as underground cable conduits for optical fibre cables ideal for cable installation by blowing technique and pulling by rope. The PLB HDPE Duct comprises of 2 concentric layers, the outer layer is HDPE and co extruded with an inner layer of solid silicone permanent lubricant to reduce the internal coefficient of fraction .