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    ASTM D720 / D720M - 15e1

    Standard Test Method for Free-Swelling Index of Coal

    Active Standard ASTM D720 / D720M | Developed by Subcommittee: D05.15

    Book of Standards Volume: 05.06

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    Significance and Use

    3.1 This test method, in addition to indicating the caking properties of a coal when burned as a fuel, can be used to give a broad indication of the degree of oxidation of a coal.

    1. Scope

    1.1 This test method2 is a small-scale test for obtaining information regarding the free-swelling properties of a coal. The results may be used as an indication of the caking characteristic of the coal when burned as a fuel. This test is not recommended as a method for the determination of expansion of coals in coke ovens.

    1.2 Warning—Breathing of asbestos dust is hazardous. Asbestos and asbestos products present demonstrated health risks for users and for those with whom they come into contact. In addition to other precautions, when working with asbestos-cement products, minimize the dust that results. For information on the safe use of chrysoltile asbestos, refer to, Safe Use of Chrysotile Asbestos: A Manual on Preventive and Control Measures.3

    1.3 The 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.

    1.4 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 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

    D2013 Practice for Preparing Coal Samples for Analysis

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    ICS Code

    ICS Number Code 73.040 (Coals)

    UNSPSC Code

    UNSPSC Code 15101601(Coal)

    Referencing This Standard

    DOI: 10.1520/D0720_D0720M-15E01

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D720 / D720M-15e1, Standard Test Method for Free-Swelling Index of Coal, ASTM International, West Conshohocken, PA, 2015,

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