... 300-8 2. water stop Tensile strength 12Mpa 3. felt carpet underlay Chengdu RenFeng Industrial Co., Ltd. Since 2002, is ... build the production of PVC water swelling belt, which is made of PVC resin, plasticizer, stabilizer raw material, mastication, granulation, ... structures, underground facilities. The specifications ofPVC water swelling belt(felt carpet underlay): Model 651: 280-7, 290-8, 300-8, ...