Coating weight or mass can be determined by test methods per ASTM A90 (Zinc), ASTM A428 (aluminum), or ASTM A309 (Terne - alloy coating of lead and tin). These coating provide protection against corrosion.

Coils can be analyzed either total both sides (single spot) or each side separately. Terne coating is usually a triple spot test.

Sample is weighed, the coating is stripped, and then it is reweighed. The results are usually reported in ^{oz/ft 2 or g/m 2.}