Water Vapor Resistances of Some Clothing Assemblies Used by Flying Personnel of the Swedish Armed Forces: A Series of Model Studies

摘要

Water vapor resistance of clothing assemblies used by the flying personnel of the Swedish armed forces was determined using a dish filled with an evaporative solution above which the clothing was fixed. Measurements were performed in a hot, dry environment without forced convection and temperature gradients. Flying suits made from Kermel are more resistive to sweat transfer compared to those made from Ventile fabric. Eiser sweat absorption shirts and Irotermo sweat absorption shirts have the same sweat transfer properties. Eiser underwear and Irotermo underwear have better sweat transfer properties than cotton underwear. Water vapor resistance depends on the sodium chloride concentration in transferred sweat. Water vapor resitance for complete clothing diminishes when the clothing becomes partly wet. Water vapor transfer can be improved by applying an air pressure gradient.