... , ISO9227 Pass 2-5 millimetersAdhesion CHECKED TESTGB/T9286-88,2mm Cross cut, ISO2409 Pass100/100, passes 0 levelsCupdrawing:Erichsen, ISO1520 Erichsen ... resistance and weather resistanceSalt spray testGB/T1771-91,500 hoursThe cross section of corrosion less than 2MMHot and damp resistance testthe GB ...