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    ASTM C849 - 88(2020)

    Standard Test Method for Knoop Indentation Hardness of Ceramic Whitewares

    Active Standard ASTM C849 | Developed by Subcommittee: C21.03

    Book of Standards Volume: 15.02


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    Significance and Use

    5.1 The Knoop indentation hardness is one of many properties that is used to characterize ceramic whitewares. Attempts have been made to relate Knoop indentation hardness to tensile strength, grinding speeds, and other hardness scales, but no generally accepted methods are available. Such conversions are limited in scope and should be used with caution, except for special cases where a reliable basis for the conversion has been obtained by comparison tests.

    1. Scope

    1.1 This test method covers the determination of the Knoop indentation hardness of ceramic whitewares and the verification of Knoop indentation hardness testing machines using standard glasses.

    1.2 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.

    1.3 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

    E4 Practices for Force Verification of Testing Machines

    E384 Test Method for Microindentation Hardness of Materials


    ICS Code

    ICS Number Code 81.060.20 (Ceramic products)

    UNSPSC Code

    UNSPSC Code


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

    DOI: 10.1520/C0849-88R20

    Citation Format

    ASTM C849-88(2020), Standard Test Method for Knoop Indentation Hardness of Ceramic Whitewares, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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