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1.1 This test method covers the measurement of steady state thermal transmission through flat slab specimens using a heat flow meter apparatus.
1.2 This is a comparative (or secondary) method of measurement since specimens of known thermal transmission properties must be used to calibrate the apparatus. Properties of the calibration specimens must be traceable to an absolute measurement method, and should be obtained from or traceable to a recognized national standards laboratory.
1.3 The test method is applicable to the measurement of thermal transmission through a wide range of specimen properties and environmental conditions. The method has been used at ambient conditions of 10 to 40°C with thicknesses up to approximately 250 mm, and with plate temperatures from -195°C to 540°C at 25 mm thickness (Refs. (5, 6)).
1.4 This test method may be used to characterize material properties which may or may not be representative of actual conditions of use. Other test methods such as Test Methods
1.5 To meet the requirements of this test method the thermal resistance of the sample must be greater than 0.10 K[dot]m /W in all directions.
1.6 It is not practical in a test method of this type to try to establish details of construction and procedures to cover all contingencies that might offer difficulties to a person without pertinent technical knowledge. Thus users of this test method shall have sufficient knowledge to satisfactorily fulfill their needs. For example, knowledge of heat transfer principles, low level electrical measurements, and general test procedures is required.
1.7 Standardization of this test method is not intended to restrict in any way the future development of improved or new methods or procedures by research workers.
1.8 Since the design of a heat meter apparatus is not a simple matter, a procedure for qualifying an apparatus is given in 7.8.
1.9 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 consult and 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.
C167 Test Methods for Thickness and Density of Blanket or Batt Thermal Insulations
C168 Terminology Relating to Thermal Insulation
C177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus
C236 Test Method for Steady-State Thermal Performance of Building Assemblies by Means of a Guarded Hot Box
C687 Practice for Determination of Thermal Resistance of Loose-Fill Building Insulation
C976 Test Method for Thermal Performance of Building Assemblies by Means of a Calibrated Hot Box
C1045 Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
C1046 Practice for In-Situ Measurement of Heat Flux and Temperature on Building Envelope Components
C1058 Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation
C1114 Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus
E178 Practice for Dealing With Outlying Observations
E230/E230M Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ISO StandardISO 8301:1991 Thermal InsulationDetermination of Steady-State Thermal Resistance and Related PropertiesHeat Flow Meter Apparatus Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
ICS Number Code 91.120.10 (Thermal insulation of buildings)
UNSPSC Code 41112234(Heat flowmeter)
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ASTM C518-98, Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus, ASTM International, West Conshohocken, PA, 1998, www.astm.orgBack to Top