1.1 This test method covers the use of X-ray fluorescence (XRF) for determining the coating weight (mass) of metallic coatings on steel sheet. The test method is intended to be used for "on-line" measurements of coating on continuous production lines.1.2 This test method is applicable to the coatings covered by the following ASTM specifications: A 599/A 599M, A 623, A 623M, A 653/A 653M, A 792/A 792M, A 875/A 875M, A 879/A 879M, A 918, and A 924/A 924M. It may be applicable to other co