ASTM C24 - 09(2013)

    Standard Test Method for Pyrometric Cone Equivalent (PCE) of Fireclay and High Alumina Refractory Materials

    Active Standard ASTM C24 | Developed by Subcommittee: C08.02

    Book of Standards Volume: 15.01


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    Significance and Use

    5.1 The deformation and end point of a cone corresponds to a certain heat-work condition due to the effects of time, temperature, and atmosphere.

    5.2 The precision of this test method is subject to many variables that are difficult to control. Therefore, an experienced operator may be necessary where PCE values are being utilized for specification purposes.

    5.3 PCE values are used to classify fireclay and high alumina refractories.

    5.4 This is an effective method of identifying fireclay variations, mining control, and developing raw material specifications.

    5.5 Although not recommended, this test method is sometimes applied to materials other than fireclay and high alumina. Such practice should be limited to in-house laboratories and never be used for specification purposes.

    1. Scope

    1.1 This test method covers the determination of the Pyrometric Cone Equivalent (PCE) of fire clay, fireclay brick, high alumina brick, and silica fire clay refractory mortar by comparison of test cones with standard pyrometric cones under the conditions prescribed in this test method.

    1.2 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.2.1 Exceptions—Certain weights are in SI units with inch-pound in parenthesis. Also, certain figures have SI units without parenthesis. These SI units are to be regarded as 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

    C71 Terminology Relating to Refractories

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

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


    ICS Code

    ICS Number Code 81.080 (Refractories)

    UNSPSC Code

    UNSPSC Code 31370000(Refractories)


    DOI: 10.1520/C0024

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