ASTM F1868
Standard Test Method for Thermal and Evaporative Resistance of Clothing Materials Using a Sweating Hot Plate
This test method measures the thermal and evaporative resistance of fabrics, films, coatings, foams, and leathers, including multi-layer assemblies, to assess their suitability for protective clothing systems. However, these lab measurements do not directly predict real-world performance, as factors like clothing weight, fit, and drape can alter thermal exchange. For a more accurate evaluation, full clothing systems can be tested using a heated manikin in an environmental chamber per Test Methods F1291 and F2370.
