Zinc Coating Mass Test ASTM A90

Zinc Coating Mass Test ASTM A90

ASTM A90 test method determines the average coating weight of zinc or zinc alloy coating over a defined region of iron or steel, which may then be used to calculate the average thickness. The test method's final results must be expressed in either inch-pound units or SI units.


    This test technique establishes a standard for calculating the weight of zinc coatings on iron and steel items. Zinc coatings on iron and steel objects provide corrosion resistance. Different designations or coating classes are typically delivered in specifications for zinc-coated goods so that the buyer can select the coating weight best suited for the intended application.

    Test Procedure:

    The zinc covering on the specimens is removed, then after cleaning the specimens with naphtha or another suitable solvent, weights of the individual specimens are determined to the nearest 0.01 g. Each specimen is dipped in the stripping solution separately after determining the weight. The specimens are washed after stripping them by scrubbing them under running water, dipping them in hot water, and then wiping or blow-drying them.

    Specimen Size : 

    The specimen is created to the measurements specified, with an area of 5.08 in².


    The following formula is used



    C is weight [mass] of coating, W1 is original weight W2 is weight of stripped specimen, A area of one surface of sheet and K is a constant.


    Weight is 0.01 oz/ft2 in inch pound unit and 1 g/m2 when reporting in metric (SI) units.


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