Thermal effusivity (Ws1/2/m2K) has been widely adopted as the key thermal performance metric for fabrics and textile materials. Sometimes referred to as thermal inertia, it is defined as the rate at which a material can absorb heat and is directly related to the interfacial surface temperature between a fabric and the human body. As such, it is the thermophysical property that describes whether a material feels warm and cozy, or cool to the touch.
At present, the Modified Transient Plane Source (MTPS) is the only method available that provides a direct measurement of effusivity. The MTPS is a proprietary, single-sided sensor technology only available through C-Therm Technologies Ltd. While other instruments may make similar claims, C-Therm’s MTPS is the only method that conforms to ASTM D7984, the standard method for quantifying thermal effusivity of fabrics for claims validation.
Join us for an in-depth explanation on the principals of operation of the MTPS and how effusivity is used for thermal performance quantification. We will highlight test requirements of the ASTM standard as well as discussing innovative and novel test approaches in both R&D and QA/QC applications. Case highlights will include testing of both low and high thermal effusivity materials, dry and saturated material testing as well as examples from industry leaders and academic researchers.
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