... the certificate of ISO9001: 2000, the national fire---proof, environmental friendly certificate and the ASTM (USA) certificate ... contains standard plasterboard, fire-proof plasterboard, moisture-proof plasterboard, gypsum ceiling tile, self tapping screw, paper joint tape, jointing ... normal design and special paint5>, Auxiliary materialsSelf tapping screw Size: 3.5mmx25mm,3.5mmx35mm,3.5mmx50mmm etc ...