... of top coating:20-25um, back coating:7-10um Prepainted Steel Coil /PPGI/PPGL from China Technique 1. Made by ... degrease,phosphorus,chromium hydrochloric acid passivation) on the surface of steel sheet ( zinc-plated,aluminium-zinc plated,nickel plated,etc.) ... ASTM A653 , Z60-180/GB/T12754-91 etcBase PlateGalvanized sheet , Galvalume SheetThickness0.18-1.5mmWidth914mm,1000mm,1200mm,1250mm,1500mm ...