... ASTM, DIN,GB Grade: CGCC, Prepainted galvanized steel coils ( steel structure roof sandwich panel ):PPGI is the material which ... detail of Prepainted galvanized steel coils : 3. Usage of Prepainted galvanized steel coils :Outdoor: roof, roof structure, surface sheet of ... .Indoor: door, isolators, frame of door, light steel structure of house, sliding door, folding screen, ceiling, internal decoration ...