waterproof wall boards 1 ISO9001 2001 2 waterproof material 3 easy installation 4 magnesium oxide waterproof board waterproof wall boards1 Application :the exterior ... , punched without defromaition, can be recycled to use as partition wall. Fire proof, water proof, aging-proof, shock proof, crack ... polluting, non-radiation, named”Green Building Material magnesium oxide waterproof wall boards