PPGI steel is produced based on galvanized steel or galvanum steel or cold rolled steel.The base metal(GI,GL OR CRC) steel should be cleaned firstly.it’s included surface chemical-degreasing and chemical-conversion treatment.After cleaned,organic painting material will be coated.the organic material can be PE,PVDF,HDP,or SMP.this coating process is very important.it’s the most important for PPGI’s ...