ASTM C1171 - 16

    Standard Test Method for Quantitatively Measuring the Effect of Thermal Shock and Thermal Cycling on Refractories

    Active Standard ASTM C1171 | Developed by Subcommittee: C08.02

    Book of Standards Volume: 15.01

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    Significance and Use

    3.1 This test method indicates the ability of a refractory product to withstand the stress generated by sudden changes in temperature.

    3.2 Because the recommended furnace temperature of this cycling test is 1200°C (2190°F), this test method may not indicate the ability of a refractory product to withstand cycling at higher or lower temperatures, especially if the existing morphology of the refractory product changes.

    3.3 This test method is useful for research and development, as well as for comparing refractory products. The precision should be considered when using this test for specification purposes.

    3.4 Ruggedness tests found the following variables to be rugged:



    hot spacing

    1/2 to 3/4 in. (12.77 to 19 mm)

    cold spacing

    1/2 to 3/4 in. (12.77 to 19 mm)

    center vs. end gripping of the bars

    hot hold time

    10 to 15 min

    cold hold time

    10 to 15 min

    operator air speed

    0 to 2 mi/h (0 to 3.2 km/h)

    initially cold or heated samples

    last in, first out (LIFO); or first in, first out (FIFO)
     removal from the furnace

    sawed or original surface as tensile face during MOR testing

    bar thickness

    0.96 to 1.04 in. (24.5 to 26.4 mm)

    1. Scope

    1.1 This test method is used for determining the strength loss or reduction in continuity, or both, of prism-shaped specimens which are cut from refractory brick or shapes and subjected to thermal cycling.

    1.2 The strength loss is measured by the difference in modulus of rupture (MOR) between uncycled specimens and the specimens subjected to thermal cycling.

    1.3 The reduction in structural continuity is estimated by the difference in sonic velocity before and after thermal cycling.

    1.4 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.

    1.5 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

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

    C607 Practice for Coking Large Shapes of Carbon-Bearing Materials

    C1419 Test Method for Sonic Velocity in Refractory Materials at Room Temperature and Its Use in Obtaining an Approximate Youngs Modulus

    E4 Practices for Force Verification of Testing Machines

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

    ICS Code

    ICS Number Code 17.200.10 (Heat. Calorimetry); 81.080 (Refractories)

    Referencing This Standard
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    DOI: 10.1520/C1171-16

    Citation Format

    ASTM C1171-16, Standard Test Method for Quantitatively Measuring the Effect of Thermal Shock and Thermal Cycling on Refractories, ASTM International, West Conshohocken, PA, 2016,

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