Pre-painted galvanized sheets (PPGI) refer to galvanized steel sheets that have been coated with a layer of paint or other protective coating. This coating helps to protect the underlying steel from corrosion and other types of damage, while also providing an attractive and durable finish. PPGI sheets are commonly used for roofing, siding, and cladding in a wide range of construction and engineering applications. They are known for their durability and resistance to corrosion, which makes them ideal for use in harsh environments or areas with high levels of moisture or salt air.