... steel or galvanum steel or cold rolled steel.The base metal(GI,Website:http://www.cnhousesteel.com, ... .After cleaned,organic painting material will be coated.the organic material can be PE,PVDF,HDP,or ... .this coating process is very important.it’s the most important for PPGI’s color,include bright ... or galvanumed steel,another is color coating material.the last coveres and protectes steel,it’s a very ...