Shandong Zhongse Heavy Industry Co., Ltd. uses high-quality high-density polyethylene as raw material, mainly producing polyethylene double wall bellows (HDPE) (24 models in eight sizes from DN200mm to DN800mm), large diameter HDPE steel belt reinforced polyethylene spiral bellows (DN300mm to DN2400mm), and PE water supply pipes (PE63, PE80, PE100). ....