Hot Dipped Galvanized
Process to coat steel to offer environmental resistance to corrosion.
Steel is dipped into a bath of molten zinc, typically kept at a temperature of 443°C to 454°C.
Zinc coating thickness varies and is designated by a G series, such as G60 or G90 or in the metric system as a Z series.
The imperial system relates to hundredths of ounces per square foot and the metric system to g per square metre.
G90 = 0.90 oz/ft2 = Z275 g/m2