PPGI is pre-painted galvanized iron, also known as pre-coated steel, coil-coated steel, color-coated steel, etc., typically with a hot dip zinc-coated steel substrate.
PPGL steel refers to pre-painted galvalume steel. It’s a durable, colorful, and economical building material which is with an Al-Zn-coated steel sheet substrate.
GI refers to galvanized iron. Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting.
Galvalume is a coating containing zinc, aluminum, and silicon that is used to prevent a metal (primarily steel) from oxidation.
Wanzhi Steel also produces metal roofing, hot-rolled coil steel, cold-rolled coil steel, whiteboard, etc.