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Lighter Compact Respirators for Toxic Vapor Protection.

PB94108123

Publication Date	1993
Personal Author	Brown, C. E.; Kalumuck, K. M.; Chahine, G. L.; Frederick, G. S.
Page Count	48
Abstract	An attempt was made to reduce the size and weight of the canisters or elements in a respirator that removes the toxic vapors from the breathed air. The system studied involved substitution of the usual activated charcoal absorbent and its required valving with a specially selected and configured polymer absorbent material combined with bidirectional flow through the porous bed. Experiments were conducted with a high boiling point vapor typical of many toxic vapors found in industrial work places. An experimental loop which simulated the human breathing cycle was designed and constructed and a polymer absorbent test module with many fine air passage channels that simulated a section of the novel respirator was cast and used in the experimental loop. When two way oscillatory flow was compared with one way flow, a dramatic increase in breakthrough time and a decrease in the concentration after breakthrough were seen with two way flow. A parametric study conducted with a numerical simulation model indicated that using of the two way oscillating flow with polymer absorbents to substantially increase the breakthrough time for toxic vapors was feasible.
Keywords	Respirators Occupational safety and health Toxic substances Industrial hygiene Protective masks Design criteria Performance evaluation Absorbers(Materials) Polymers Indoor air pollution
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	68G - Environmental Health & Safety 68A - Air Pollution & Control 57U - Public Health & Industrial Medicine 95G - Protective Equipment
Corporate Authors	DynaFlow, Inc., Fulton, MD.; National Inst. for Occupational Safety and Health, Cincinnati, OH.; National Science Foundation, Washington, DC. Small Business Innovation
Supplemental Notes	Sponsored by National Science Foundation, Washington, DC. Small Business Innovation Research Programs, and National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199402

Lighter Compact Respirators for Toxic Vapor Protection.

Lighter Compact Respirators for Toxic Vapor Protection.
PB94108123

Publication Date	1993
Personal Author	Brown, C. E.; Kalumuck, K. M.; Chahine, G. L.; Frederick, G. S.
Page Count	48
Abstract	An attempt was made to reduce the size and weight of the canisters or elements in a respirator that removes the toxic vapors from the breathed air. The system studied involved substitution of the usual activated charcoal absorbent and its required valving with a specially selected and configured polymer absorbent material combined with bidirectional flow through the porous bed. Experiments were conducted with a high boiling point vapor typical of many toxic vapors found in industrial work places. An experimental loop which simulated the human breathing cycle was designed and constructed and a polymer absorbent test module with many fine air passage channels that simulated a section of the novel respirator was cast and used in the experimental loop. When two way oscillatory flow was compared with one way flow, a dramatic increase in breakthrough time and a decrease in the concentration after breakthrough were seen with two way flow. A parametric study conducted with a numerical simulation model indicated that using of the two way oscillating flow with polymer absorbents to substantially increase the breakthrough time for toxic vapors was feasible.
Keywords	Respirators Occupational safety and health Toxic substances Industrial hygiene Protective masks Design criteria Performance evaluation Absorbers(Materials) Polymers Indoor air pollution
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	68G - Environmental Health & Safety 68A - Air Pollution & Control 57U - Public Health & Industrial Medicine 95G - Protective Equipment
Corporate Authors	DynaFlow, Inc., Fulton, MD.; National Inst. for Occupational Safety and Health, Cincinnati, OH.; National Science Foundation, Washington, DC. Small Business Innovation
Supplemental Notes	Sponsored by National Science Foundation, Washington, DC. Small Business Innovation Research Programs, and National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	199402