ASTM C217 / C217M - 09

    Standard Test Method for Weather Resistance of Slate

    Active Standard ASTM C217 / C217M | Developed by Subcommittee: C18.01

    Book of Standards Volume: 04.07


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    Significance and Use

    This test method is useful in indicating the differences in weather resistance between various slates. This test method also provides one element in the comparison of slates.

    1. Scope

    1.1 This test method covers two procedures for weather resistance of slate in all outdoor installations by determining the depth of softening by an abraser or by hand scraping.

    Note 1—The test is based on the fact that slates containing pyrite, calcite, and carbon undergo a chemical weathering which results in the conversion of the calcite particles to gypsum. The swelling action that results causes disintegration of the slate. The extent of this action on various slates in the test has been found to correlate with the durability of the materials in actual weathering.

    1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    1.3 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

    C119 Terminology Relating to Dimension Stone


    ICS Code

    ICS Number Code 91.100.15 (Mineral materials and products)

    UNSPSC Code

    UNSPSC Code 11111606(Slate)


    Referencing This Standard

    DOI: 10.1520/C0217_C0217M-09

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM C217 / C217M-09, Standard Test Method for Weather Resistance of Slate, ASTM International, West Conshohocken, PA, 2009, www.astm.org

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