ASTM C730 - 98(2013)

    Standard Test Method for Knoop Indentation Hardness of Glass

    Active Standard ASTM C730 | Developed by Subcommittee: C14.04

    Book of Standards Volume: 15.02


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    Significance and Use

    4.1 The Knoop indentation hardness is one of many properties that is used to characterize glasses. 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 glass 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 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

    E4 Practices for Force Verification of Testing Machines

    E384 Test Method for Knoop and Vickers Hardness of Materials


    ICS Code

    ICS Number Code 81.040.10 (Raw materials and raw glass)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard

    DOI: 10.1520/C0730

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM C730-98(2013), Standard Test Method for Knoop Indentation Hardness of Glass, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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