ASTM C177-97

    Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus


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    1. Scope

    1.1 This test method covers the achievement and measurement of steady-state heat flux through flat-slab specimens using a guarded-hot-plate apparatus. The method encompasses both the single-sided and the double-sided mode of measurement. Both distributed and line source guarded heating plate designs are included, in principle, in this test method. The reader should consult the standard practices on the single-sided mode of operation and on the line source apparatus for further details on these variations of the method.

    1.2 The calculations of thermal transmission properties based upon measurements using this method shall be performed in conformance with Practice C1045.

    1.3 This is an absolute (or primary) method of measurement since no heat flux reference standards are required except to confirm accuracy statements and to establish traceability to recognized standards. This absolute method is contrasted with a comparative (or secondary) method, such as Test Method C518, in which the results are directly dependent on heat flux reference standards.

    1.4 This test method is applicable to the measurement of a wide variety of specimens, ranging from opaque solids to porous or transparent materials, and a wide range of environmental conditions. Special precautions in the measurement process are described for the following:

    1.4.1 Specimens exhibiting appreciable inhomogeneities, anisotropies, rigidity, or extremes of thermal flux density.

    1.4.2 Measurements conducted at extremes of temperature (either high or low) or under vacuum conditions.

    1.5 This test method is intended to allow a wide variety of apparatus designs and design accuracies to satisfy the requirements of specific measurement problems. Compliance with this test method requires a statement of the uncertainty of each reported variable in the report. Therefore, in the following sections, the significant error factors will be discussed.

    1.6 This standard does not purport to address all of the safety problems, 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

    C168 Terminology Relating to Thermal Insulation

    C518 Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus

    C687 Practice for Determination of Thermal Resistance of Loose-Fill Building Insulation

    C1043 Practice for Guarded-Hot-Plate Design Using Circular Line-Heat Sources

    C1044 Practice for Using a Guarded-Hot-Plate Apparatus or Thin-Heater Apparatus in the Single-Sided Mode

    C1045 Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions

    C1058 Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation

    C1363 Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus

    E230 Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples

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

    ISO Standard

    ISO 8302 Thermal InsulationDetermination of Steady-State Areal Thermal Resistance and Related PropertiesGuarded-Hot-Plate Apparatus Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.


    ICS Code

    ICS Number Code 17.200.10 (Heat. Calorimetry)

    UNSPSC Code

    UNSPSC Code 41112200(Temperature and heat measuring instruments)


    Referencing This Standard
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    DOI: 10.1520/C0177-97

    Citation Format

    ASTM C177-97, Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus, ASTM International, West Conshohocken, PA, 1997, www.astm.org

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