... control,have attained ISO9001 certification and so on. BASE SUBSTRATEHot dip galvanized steel (HDGI),ZINCALUME STEEL COIL.GRADESGCC,ENG10142, DX51D, ASTM ... per yearQUALITY QURANTEE10 YEARS OF OUTDOOR USING FOR PEBASE SUBSTRATEHot dip galvanized steel (HDGI), ZINCALUME STEEL COILGRADESGCC,ENG10142, DX51D, ASTM A653ZINC ...