... , chemical conversion processing), coated by the method of continuous coatings (roller coating method), and after roasting and cooling.PPGI is ... material, while ppgi has good effects on the areas of replacing wood with steel, efficient construction, energy saving ... Time15-30daysMOQ25 TonsCertificateSGS or BV Certificate if needed;cost of inspection for buyerUsagewidely used for roofs, outer walls, ...