ASTM A239-21

2.1?This practice provides the procedure to locate the thinnest portions of the zinc coating on newly coated items (see Appendix X1) produced to a product specification under the jurisdiction of ASTM Committee A05 and its subcommittees as designated by a purchaser in a purchase order or contract.

2.2?Limitations of the Practice:?

2.3?Examples of coated articles that can be tested are: electrical metallic tubing and rigid conduit pipe, castings and forgings, and structural steel; on special hardware, such as pole line, builder's, and farm implement hardware; bolts, nuts, screws, and other miscellaneous general hardware.

1.1?This practice covers the procedure for locating, by the use of a solution of copper sulfate, the thinnest spot in a zinc coating (hot dipped, electroplated, or sprayed) on iron or steel articles that are coated after the shape is produced by casting, drawing, pressing, or other forming methods.

1.2?UnitsThe values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.