Define

1, heat preservation rate: the percentage of heat dissipation without sample and the difference between heat dissipation and heat dissipation without sample.

2, thermal resistance: the temperature difference between the two sides of the sample and the ratio of heat flow per unit area through the sample vertically. The dry heat flow may be transmitted by one or more of the following: conduction, convection, radiation.

Thermal resistance is measured in square meters kelvin per watt (m2·K/W), which represents the dry heat flow through a specified area of the textile under a stable temperature gradient.

The test method

1. Heat preservation rate

"GB/T 11048-1989 Textile insulation performance test method" method A

This standard is referenced in FZ/T 73022-2012 Knitted Thermal Underwear 5.4.7

2, thermal resistance

GB/T 11048-2008 "Determination of thermal resistance and wet resistance of Textiles under physiological comfort Steady condition (replaced)" Model A instrument-evaporative hot plate method, Model B instrument-static plate method.

GB/T 11048-2018 "Determination of Thermal Resistance and wet Resistance of Textiles under Physiological Comfort Steady State conditions (evaporative hot plate method) (same as the method of 2008 version A instrument)

GB/T 35762-2017 "Textile heat transfer performance test method plate method" (the same as the 2008 version of B instrument method).

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