... alloy, this product has the excellent fire resistance, and is corrosion resistant and easy to clean, complying with requirements of enviornmental protection ... , 500*500, 600*600, 300*500, 300*600, 300*900 and 600*12000,.Patterns of ceilings with open keels (iterated plates ... ): 600*600 and 300*600, with the thickness up to 0.3-3 ...