... produced PVC hollow panels which is national promotion used green products,waterproof,fire retardant,anti-corrosion,no ... 2) Waterproof, moisture proof --------- 100% waterproof, it will not occurs any deformation even been immersed in water;(3) Fire protection, ... acid and alkali -------------- even with acid, alkali solution rinse will not damage;(7) High strength, long service life ------- compared ...