PPGI Steel Manufacture are made of hot dipped galvanized sheet or galvalumed plate etc. After surface pretreatment (chemical degreasing and chemical conversion treatment), one or several layers of organic coating are applied on the surface, and then baked and solidified. Also because there are a variety of different color paint steel coil from this, abbreviated prepainted galvanized steel coil with all RAL colour code. Color-coated steel strip using hot-dip galvanized steel strip as base material in PPGI steel manufacture. The organic coating on the zinc layer provides coverage and protection against rust and the service life is about 1.5 times longer than that of the galvanized steel.