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    ASTM D6905 - 20

    Standard Practice for Impact Flexibility of Organic Coatings

    Active Standard ASTM D6905 | Developed by Subcommittee: D01.23

    Book of Standards Volume: 06.01


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    Significance and Use

    5.1 Coatings attached to substrates are subjected to damaging impacts during the manufacture of articles and their use in service. This impact resistance practice has been found to be useful in predicting the performance of organic coatings for their ability to resist cracking caused by impacts.

    1. Scope

    1.1 This practice covers a procedure for determining the ability of a coating film and its substrate to resist shattering, cracking, or chipping when the film and substrate are distended beyond their original form by impact.

    1.2 This practice does not measure impact resistance but uses rapid impact to improve Test Methods D522, a test method for flexibility. Since the impact of the coating is almost instantaneous, all of the problems associated with time variables in the mandrel tests are eliminated.

    1.3 This practice is similar in content but not technically equivalent to Test Method D2794.

    1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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

    1.6 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.


    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

    D522 Test Methods for Mandrel Bend Test of Attached Organic Coatings

    D609 Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products

    D823 Practices for Producing Films of Uniform Thickness of Paint, Coatings and Related Products on Test Panels

    D2240 Test Method for Rubber PropertyDurometer Hardness

    D2794 Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)

    D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals


    ICS Code

    ICS Number Code 25.220.60 (Organic coatings)

    UNSPSC Code

    UNSPSC Code 46181533(Protective coats)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D6905-20

    Citation Format

    ASTM D6905-20, Standard Practice for Impact Flexibility of Organic Coatings, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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