1.1 This test method establishes the criteria for the quantitative measurement of thermal effusivity and related thermal properties such as thermal conductivity of fabrics using the modified transient plane source (MTPS) technique and apparatus. The test method is a comparative one and is based on calibration of the apparatus with known traceable material samples with known thermal properties. 1.2 This test method can be developed for a range of temperatures between -50 C to +200 C, or higher depending on the sample holder design. This would require an environmental chamber for testing at non-ambient temperatures. Thermal effusivity measurement at ambient conditions does not require an environmental chamber; however, the sensor and the sample under test must be at approximately the same temperature. This test method can be applied to any material with a thermal effusivity range in the range of 6 to 19,000 Ws/mK. 1.3 This test method can be used to test very small sample of specimen material and demands that the sample material fully cover the active area of the sensor. Air convection should be kept to a minimum in order not to cause temperature fluctuations during the measurement. 1.4 Units The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 application of regulatory limitations prior to use.
The test method measures the effusivity and related thermal properties such as thermal conductivity of fabrics. The effusivity of fabrics relates most to the feeling of coldness or warmness that a human feels when a fabric or cloth is in contact with skin/therefore, effusivity and a simple method to measure it is of great value to applications of fabric along with the inherent need for thermal conductivity data. It will be used for product development and quality control.
Keywordstextiles; fabrics; thermal effusivity; thermal conductivity; modified transient plane source
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top