Shanghai Renzhong Industry Co., Ltd. Ia a leading manufacturer of waterproof materials in China. We provide professional waterproofing materials like Geosynthetic Clay Liners (GCLs) and Composite Geomembrane, our products have been used in lots of international projects such as Shanghai World Expo China Pavilion. You can send me a mail or add my skype(aaronkooghl) if you have any interents in our products.