... investment, long using life, convenient operation methods, nowadays rubber dam plays positive effect on town and countryside's regulation and management ... -3Using EPDM, with nylon canvas as a skeleton, two cloth three glue, monolayer thickness of 10 mm L×W=20m×2m ... , desiccant termination canister included, Base (with 304#stainless steel)etc. Three cloth four glue rubber dam bladder