EFFECTS OF VARIOUS GASES ON HANDGEAR INSULATION
Final rept. Sep 1964-Mar 1965
AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
Pagination or Media Count:
The effect of gases having different thermal conductivities on the thermal insulation of handgear was investigated. Experimental mittens with special plastic spacer interliners of various thicknesses were sealed between gas impermeable outer and inner shells and filled first with room air as control, then various experimental gases, and thermal insulation measured on a copper hand. Experimental gases included carbon dioxide, Freon-12, and helium. Comparative results are presented in terms of percentage insulation change clo per inch conductivity K values and the measured thermal insulation clo values. Before all tests each mitten was evacuated 13 cm Hg to remove all entrapped air, then filled without contamination with the control, or experimental gas. Gas within the handgear was maintained at a constant positive pressure 7.6 mm water throughout each experiment. Mean measurements showed significant increases 13-32 of thermal insulation for Freon-12 and carbon dioxide, with decreased insulation observed with helium. Significance and some practical application of these results for protective clothing design are shown.
- Protective Equipment