scope:

This standard describes a procedure for determining shop or field conformance to a specified coating dry film thickness (DFT) range on ferrous and non-ferrous metal substrates using nondestructive coating thickness gages (magnetic and eddy current) described in ASTM D7091.¹

The procedures for adjustment and measurement acquisition for two types of gages: "magnetic pull-off" (Type 1) and "electronic" (Type 2) are described in ASTM D7091.

This standard defines a procedure to determine whether coatings conform to the minimum and the maximum thickness specified. See Note 12.1 for an example of a possible modification when measuring dry film thickness on overcoated surfaces.

This standard is not intended to be used for measurement of thermal spray coatings. The thickness measurement procedures for thermal spray coatings applied over steel substrates are described in SSPC-CS 23.00/AWS C2.23M/NACE No. 12.

¹ ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. For referenced ASTM standards visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards volume information, or to review the scope of an ASTM standard, refer to the standard's Document Summary page on the ASTM website.