ASTM F3628-23 pdf free download – Standard Test Method For Measuring The Cooling Energy Provided By Wicking Liquid Moisture And Evaporating It From Clothing Materials Using A Sweating Hot Plate.
Clothing is often made of materials that are designed to enhance the pickup and distribution of liquids (wicking) to promote the evaporation of sweat. Higher amounts of evaporation should lead to more cooling of the body during active work and less of a chilling effect after active work has stopped.
This is important to individuals wearing PPE or athletic wear to enhance comfort and prevent overheating while working. Therefore, it is important to isolate and quantify the amount of cooling provided by a clothing material’s ability to distribute and evaporate liquid away from a heated surface.Just as important, it’s also important to isolate and quantify the amount of cooling provided and the amount of time it takes to remove all the liquid after it is no longer being delivered to the surface.
This test method covers the measurement of the cooling energy released back to the wearer’s skin by a clothing material’s ability to move and evaporate controlled dosages of water under controlled ambient conditions using a sweating hot plate.
This test method establishes procedures for measuring the cooling energy during a simulated “sweating” phase and in a drying phase. Calculations are also provided to determine the drying time and how efficient the clothing material is at assisting in the evaporation of liquid water by comparing it to the maximum amount of energy that can be lost.

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