American Society for Testing and Materials (ASTM)
The integrity of the coating shall be determined by visual inspection and coating thickness measurements.
Mass of Zinc Coating for Various Classes of Material
Washers under 5 mm (0.196 in) thick
Washers 5 mm (0.196 in) to 6 mm (0.236 in) thick
Washers over 6 mm (0.236 in) thick
(2) The mass of coating in this Standard is in terms of grams per square metre of surface area. In the continuous galvanized sheet and strip industry, mass of coating is defined in terms of grams per square metre of sheet, both sides inclusive.
(3) In the case of products galvanized after being assembled from various material classifications listed in Table 1, the coating mass of each class shall be as shown in Table 1.