Propylene, mainly through the use of halogenated flame retardants and antimony trioxide synergist interaction to obtain flame retardant polypropylene, usually the first to add a high concentration of flame retardants and other additives in polypropylene PP specification sections, through blending manufacture of flame-retardant masterbatch, and then sliced ??with conventional polypropylene fibers melt spinning the polyether urethane sealing material used. Such as the use of other sealing materials should not contain mineral oil, petroleum jelly and other chemicals that affect performance polyethylene products. Bitumen membrane English: bituminous waterproof sheet: Which cheap PP, waterproof Shouguang Tianxiang (certified), polypropylene supplied by Shouguang City Tianxiang waterproof material plant. Shouguang City Tianxiang waterproof material plant (www.txfscl.com) Shandong Weifang, waterproof, moisture-proof material leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Shouguang Tianxiang waterproof leadership with the staff warmly welcome all inquiries negotiations to create Shouguang Tianxiang waterproof better future.