ASTM B568 - 98(2009)

    Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry

    Active Standard ASTM B568 | Developed by Subcommittee: B08.10

    Book of Standards Volume: 02.05


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    ASTM B568

    Significance and Use

    This is a sensitive, noncontact, and nondestructive method for measuring the coating thickness (and in some cases, coating composition) of metallic and some nonmetallic coatings over a range of thicknesses from as little as 0.01 μm to as much as 75 μm depending on the coating and substrate materials. It can be used to measure coating and base combinations that are not readily measured by other techniques.

    The coating thickness is an important factor in the performance of a coating in service.

    1. Scope

    1.1 This test method covers the use of X-ray spectrometry to determine thickness of metallic and some nonmetallic coatings.

    1.2 The maximum measurable thickness for a given coating is that thickness beyond which the intensity of the characteristic secondary X radiation from the coating or the substrate is no longer sensitive to small changes in thickness.

    1.3 This test method measures the mass of coating per unit area, which can also be expressed in units of linear thickness provided that the density of the coating is known.

    1.4 Problems of personnel protection against radiation generated in an X-ray tube or emanating from a radioisotope source are not covered by this test method. For information on this important aspect, reference should be made to current documents of the National Committee on Radiation Protection and Measurement, Federal Register, Nuclear Regulatory Commission, National Institute of Standards and Technology (formerly the National Bureau of Standards), and to state and local codes if such exist.

    1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials

    International Standard

    ISO3497 Metallic Coatings--Measurement of Coating Thickness--X-ray Spectrometric Methods


    ICS Code

    ICS Number Code 17.040.20 (Properties of surfaces)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/B0568-98R09

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