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G40 G60 G90 Galvalume Steel Coil 

The meaning of G40, G60, G90
G40: Indicates a weight of at least 40 ounces of zinc per square foot of steel plate.
G60: Indicates a minimum weight of 60 ounces of zinc per square foot of steel plate.
G90: Indicates a weight of at least 90 ounces of zinc per square foot of steel plate.

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