Usually PPGI refers to PPGI Coil (color-coated galvanized coil), PPGI Sheet (color-coated galvanized sheet) and other steel products. It is based on the galvanized roll with a certain technology and then covered with colored paint to give the product more colors, and this colorful and beautiful surface makes it more widely used. For galvanized rolls, the sheet steel is immersed in a molten zinc bath to make a sheet of zinc coated on its surface. http://www.asia-east-steel.com/galvanized-roll/