YHM is one of the major suppliers to the plastics pipe industry and we are proud to actively be an advocate and are dedicated to the advancement of polymer pipe systems. Our black masterbatch are made of HDPE carrier, that could can be used in various shapes of sewage treatment equipment, its corrosion resistance and High strength stability make these equipment can be used for a long time and maintain good operating condition. Like corrugated pipe, irrigation pipe and water supply pipe.