ASTM C621 - 09(2014)

    Standard Test Method for Isothermal Corrosion Resistance of Refractories to Molten Glass

    Active Standard ASTM C621 | Developed by Subcommittee: C08.10

    Book of Standards Volume: 15.01


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    Significance and Use

    3.1 This test method provides a rapid, inexpensive method for comparing the corrosion resistance of refractories. The isothermal conditions of this test method represent the most severe static corrosion environment possible at the specified test temperature. This test method is suitable for quality control, research and development applications, and for product value studies on similar materials. Tests run at a series of temperatures are often helpful in determining the use temperature limitations of a particular material. Melt-line corrosion results are also a useful indication of relative resistance to both upward and downward drilling corrosion mechanisms. Examination of test specimens also provides information about the tendency for a particular refractory to form stones or other glass defects.

    3.2 Because this test method is both isothermal and static and since most glass-contact refractories operate in a dynamic system with a thermal gradient, test results do not directly predict service in a furnace. The effects of differing thermal conductivities, refractory thickness, artificial cooling or insulation upon the refractory thermal gradient, and the erosive action of moving molten glass currents are not evaluated with this test.

    1. Scope

    1.1 This test method covers the determination of the corrosion resistance of refractories in contact with molten glass under static, isothermal conditions.

    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.

    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

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques


    ICS Code

    ICS Number Code 81.080 (Refractories)

    UNSPSC Code

    UNSPSC Code 31370000(Refractories)


    Referencing This Standard

    DOI: 10.1520/C0621-09R14

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM C621-09(2014), Standard Test Method for Isothermal Corrosion Resistance of Refractories to Molten Glass, ASTM International, West Conshohocken, PA, 2014, www.astm.org

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