Physiological Evaluation of Chemical Protective Clothing
NAVY CLOTHING AND TEXTILE RESEARCH FACILITY NATICK MA
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Physiologists evaluated chemical warfare CW protective clothing ensembles worn by 8 volunteers working M170 Wsq m for 3 hours in up to 5 different environments, consisting of a control 22.2 C50 r.h., and a warm humid 29.4 C45 r.h., a hot humid 35 C60 r.h. with and without a 4.5 m sec wind, and a hot dry 48.9 C20 r.h. climate. The evaluated uniforms were the British Mark III, two-piece, permeable CW outfit and the Norwegian Helly- Hansen, one-piece, semi-permeable garment. The Mark III was evaluated alone, with the wet-weather WW gear over it to make the CW garment impermeable, and finally with a wettable cover WC over the WW to alleviate some of the thermal stress. All CW clothing ensembles consisted of the standard Navy utility uniform chambray shirt and denim trousers, CW uniform, standard U.S. Army butyl boots and gloves, and Navy Mark V mask. This study revealed the following 1 the least stressful CW ensemble was the Mark III with no overgarment 2 the Norwegian and Mark III WW uniforms were the most stressful and created almost identical thermal stress, except for lower skin temperatures and higher evaporation rates with the Norwegian uniforms and 3 heat stress can be somewhat alleviated, and tolerance time thereby increased, with the use of an outer wettable cover over impermeable CW garments.
- Chemical, Biological and Radiological Warfare