Testing textiles and fabrics
The Thermal Effusivity Measurement Module enables direct testing of Thermal Effusivity along one direction of low to high thermally conductive samples using our Hot Disk® or Hot Strip® sensors. If the volumetric Specific Heat Capacity of the sample is known, the Thermal Conductivity and Thermal Diffusivity can also be determined. The measurement technique differs if the sample is low or high thermally conductive, i.e., if the Thermal Effusivity of the sample is lower or higher than 1000 W*sqrt(s)/m2/K. Both cases support single- and double-sided sample testing, where the former enables rapid QC testing while the latter maximizes measurement accuracy.
For low thermally conductive samples, a transient temperature reading is performed with the thermal probing depth restricted to only a fraction of the sensor’s diameter/width (maximum 1/10 for isotropic samples and 1/30 for anisotropic samples). The measurement technique is tailored explicitly for testing soft/flexible materials of limited thickness, such as textiles and clothing fabrics. It can also conveniently test cushioning materials used in pillows and madrassas.
For higher thermally conductive samples, the measurement technique is akin to our One-Dimensional Measurement Module, where the sample’s surface area should be matched to the area of the sensor. In this scenario, the Thermal Effusivity Measurement Module is suitable for testing thermal interface materials.
The Thermal Effusivity Measurement Module meets ISO standard 22007-7. Hot Disk AB has contributed to the development of this standard, and the theory behind originates from our paper published in Review Scientific Instruments in 20031.
Thermal Effusivity Range:
| Instruments | Range |
|---|---|
| TPS 3500, TPS 2500 S | 20 to 55000 W*sqrt(s)/m²/K |
| TPS 1500 | 20 to 35000 W*sqrt(s)/m²/K |
| TPS 1000 | 20 to 40000 W*sqrt(s)/m²/K |
