Calcutta Canvas Co. Offers Cotton Fabric Chemical Process Tarpaulin. Calcutta Canvas Co. Manufactures Cotton Canvas Cloth, Polyester Cotton Cloth, Waterproof and Rot proof Chemical Canvas Cloth, Tents, Scooter & Car Covers. The Cotton Fabric Chemical Process Tarpaulin is suitable for truck covers, cement factories, sugar mills, agriculture, industries, govt. Departments, etc.