Zinc Content in G90 Galvanizing Steel Plate

G90 means that choosing three points in galvanizing steel plate's two faces, the minimum weight of zinc is 0.9 oz/ft² _. 

_1oz=0.284kg.

_{0.9oz=0.2556kg=25.56g.}

_1ft=0.093m²_.

_{25.56/0.093=275g/m}²_.

_{So G90 means that there is 275gram zinc per square meters.}

_{G90 is a American Standard.}

_{The relationship between zinc weight and zinc thickness:}

_{50g/m² =7.1um}

_275g/m²_=39.05um

The reason why I or many seller in China will convert G90 to zinc thickness or Salt Spray Test's time is that China's regular standard is different with the United States or America.

Hoping that you can understand the detail meaning of G90.