1.specification PVC material for water stop 280-7, 290-8, 300-8, 2. water ... about waterproofing. Not only have the professional high quality waterproof material for supplying, but also trained a batch of proficient technical personnel ... -stop, which is made of PVC resin, plasticizer, stabilizer raw material, mastication, granulation, extrusion, forming, with the anti-aging, anti-corrosive ...