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Designation: E376 − 26Standard Practice forMeasuring Coating Thickness by Magnetic-Field or EddyCurrent (Electromagnetic) Testing Methods 1This standard is issued under the f i xed designation E376; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This practice covers the use of magnetic- and eddycurrent-type thickness instruments (gauges) for nondestructivethickness measurement of a coating on a metal (that is,electrically conducting) substrate. The substrate may be ferrousor nonferrous. The coating or plating being measured may beelectrically conducting or insulating as well as ferrous ornon-ferrous.1.2 More specif i c uses of these instruments are covered byPractice D7091 and the following test methods issued byASTM: Test Methods B244, B499, and B530.1.3 Units—The values stated in SI units are to be regardedas standard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.4 Measurements made in accordance with this practicewill be in compliance with the requirements of ISO 2178 asprinted in 1982.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2B244 Test Method for Measurement of Thickness of AnodicCoatings on Aluminum and of Other NonconductiveCoatings on Nonmagnetic Basis Metals with Eddy-Current InstrumentsB499 Test Method for Measurement of Coating Thicknessesby the Magnetic Method: Nonmagnetic Coatings onMagnetic Basis MetalsB530 Test Method for Measurement of Coating Thicknessesby the Magnetic Method: Electrodeposited Nickel Coat-ings on Magnetic and Nonmagnetic SubstratesD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic, Nonconductive Coat-ings Applied to Non-Ferrous MetalsE543 Specif i cation for Agencies Performing NondestructiveTestingE1316 Terminology for Nondestructive Examinations2.2 ISO Standards: 3ISO 2178 Non-magnetic coatings on magnetic substrates —Measurement of coating thickness — Magnetic methodN OTE 1—See Appendix X1.3. Terminology3.1 Def i nitions—For def i nitions of terms relating to thispractice, refer to Terminology E1316.4. Signif i cance and Use4.1 General—Most thickness gauges are not applicable toall combinations of coating-substrate thicknesses and materi-als. The limitations of a particular instrument are generally1 This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.07 onElectromagnetic Method.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 1989. Last previous edition approved in 2019 as E376 – 19. DOI: 10.1520/E0376-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.3 Available from American National Standards Institute (ANSI), 1180 Avenue ofthe Americas, 10th Floor, New York, NY 10036, http://www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1