it possesses both specific features of organic polymer and steel, it's an ... covered with organic coatings so it possesses both specific features of organic polymer and steel, its an innovation combined ... .Application Building roof , roof structure component, mask plate of balcony, windowsill,newspaper booth, garage, roller shutter door, ... 17>540~70 or <40> 2H< 3T270~500>22>9> 500 hrs>100>50 Color Coil