ASTM C27 - 98(2013)

    Standard Classification of Fireclay and High-Alumina Refractory Brick

    Active Standard ASTM C27 | Developed by Subcommittee: C08.92

    Book of Standards Volume: 15.01


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    ASTM C27

    Significance and Use

    3.1 Alumina-silica refractory brick is produced from various combinations of alumina and silica-containing materials. These bricks can vary in chemical composition from almost 100 % alumina and little silica to almost 100 % silica and little alumina. It is therefore useful to establish a classification scheme based on physical properties and chemical analysis. One group, fireclay brick, is classified based on physical properties since some overlap of alumina and silica content can occur. A second group, high-alumina brick, is classified primarily based on alumina content. The classification allows those familiar with refractory materials to group similar products from various suppliers in a standard and consistent manner.

    1. Scope

    1.1 This classification covers machine-made fireclay and high-alumina refractory brick, and its purpose is to set forth the various classes and types of these materials in accordance with their normal and characteristic properties, which are important in their use.

    1.2 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.


    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

    C16 Test Method for Load Testing Refractory Shapes at High Temperatures

    C24 Test Method for Pyrometric Cone Equivalent (PCE) of Fireclay and High Alumina Refractory Materials

    C113 Test Method for Reheat Change of Refractory Brick

    C133 Test Methods for Cold Crushing Strength and Modulus of Rupture of Refractories

    C134 Test Methods for Size, Dimensional Measurements, and Bulk Density of Refractory Brick and Insulating Firebrick


    ICS Code

    ICS Number Code 81.080 (Refractories)

    UNSPSC Code

    UNSPSC Code 31371105(High alumina bricks); 31371108(Fire clay brick)


    DOI: 10.1520/C0027

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