The American Society for Testing and Materials (ASTM) has proposed a new international textiles standard to test thermal effusivity of materials. The proposed new international standard, ASTM WK43374, Test Method for Measurement of Thermal Effusivity of Fabrics Using a Guarded Modified Transient Plane Source (MTPS) Instrument, will be useful in measuring the thermal properties of textiles.
Thermal effusivity is a measure of how a material exchanges heat with another material with which it is in contact. Measuring the thermal effusivity of textiles reveals the rate at which a fabric absorbs heat when it first comes into contact with skin. Fabrics with high thermal effusivity quickly draw heat away from the skin on initial contact.
The proposed standard is intended for apparel fabrics but has the potential to be used for other household textiles, including bedsheets and upholstery, as well as textiles used in the automobile industry, in which the thermal effusivity of a material is may be interest.