Special design for mold, screw, reducer to solve those problems such as C-PVC materials high fusing temperature, high viscosity, difficult for plasticization, easy to decompose. The underground buried C-PVC high voltage cable sleeves: high intensity, high temperature resistance, aging resistance, corrosion resistance, perfect insulation, excellent flame resistance and easy for application. Comply with B/T2479-2000 & Q/YSTH-1999 standard. Specified pipe series for low and high voltage cable laying protection. Best choice for city construction with bright future.