... co.,Ltd is made of natural raw materials of sodium-bentonite.It is raw and natural materials,;aging and corrosion seldom ... It is a pure natural, new, green waterproof material.2. Permanent waterproof, excellent performanceNatural sodium bentonite was formed billions ... is completed. The performance of Liu Fang Zi brand natural sodium bentonite such as water-swelling, water proof, viscosity, plasticity ...