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    ASTM C748 - 20

    Standard Test Method for Rockwell Hardness of Graphite Materials

    Active Standard ASTM C748 | Developed by Subcommittee: D02.F0

    Book of Standards Volume: 05.05

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    Significance and Use

    4.1 A Rockwell L scale hardness number is a number derived from the net increase in depth of impression as the load on a 6.3500 mm ± 0.0025 mm diameter steel-ball indenter is increased from a fixed 10 kg minor load to a 60 kg major load and then returned to the minor load.

    4.2 A Rockwell hardness number is directly related to the indentation hardness of a material; the higher the Rockwell L scale reading, the harder the material. The test is useful in the evaluation and the manufacturing control of carbon and graphite materials.

    1. Scope

    1.1 This test method covers Rockwell L scale hardness testing of graphite materials with grain size less than 0.8 mm and a hardness range between 0 and 120.

    1.2 Test Methods E18 shall be followed except where otherwise indicated.

    1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.4 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.

    1.5 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

    E18 Test Methods for Rockwell Hardness of Metallic Materials

    E171 Practice for Conditioning and Testing Flexible Barrier Packaging

    ICS Code

    ICS Number Code 71.060.10 (Chemical elements)

    UNSPSC Code

    UNSPSC Code 11101507(Graphite)

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

    DOI: 10.1520/C0748-20

    Citation Format

    ASTM C748-20, Standard Test Method for Rockwell Hardness of Graphite Materials, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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