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Collection of silica and asbestos aerosols by respirators at steady and cyclic flow

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008  940707e19900801usa|||| | |00010|eng d
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040  ‎$a‎MAP‎$b‎spa
084  ‎$a‎872
1001 ‎$0‎MAPA20080092610‎$a‎Brosseau, L.M.
24510‎$a‎Collection of silica and asbestos aerosols by respirators at steady and cyclic flow‎$c‎L.M. Brosseau, M.J. Ellenbecker, and J.S. Evans
520  ‎$a‎Air purifying dust/mist respirators are presently tested using a silica aerosol under conditions of steady flow. In experiments, the predictive validity of suchs tests was evaluated by testing respirators using silica and asbestos aerosols under conditions of both steady and cyclic flow. Silica penetration at steady flow was reasonably predictive of silica penetration under cyclic flow. However, asbestos penetration under cyclic flow was not predicted well by penetration of either silica or asbestos at steady flow. Furthermore, the potential for exhalation valve failure under cyclic flow was identified. Current NIOSH protocols for evaluating respirator performance should be reconsidered in light of these findings
65011‎$0‎MAPA20080585679‎$a‎Higiene industrial
65011‎$0‎MAPA20080605278‎$a‎Contaminantes químicos
65011‎$0‎MAPA20080549534‎$a‎Aerosoles
65011‎$0‎MAPA20080542832‎$a‎Amianto
65011‎$0‎MAPA20080542313‎$a‎Sílice
65011‎$0‎MAPA20080584412‎$a‎Corrientes de aire
65011‎$0‎MAPA20080601393‎$a‎Equipos respiratorios
65011‎$0‎MAPA20080539948‎$a‎Tests
7001 ‎$0‎MAPA20080317249‎$a‎Ellenbecker, Michael J.
7001 ‎$0‎MAPA20080097868‎$a‎Evans, John S.
7400 ‎$a‎American Industrial Hygiene Association journal
7730 ‎$t‎American Industrial Hygiene Association journal‎$d‎Akron, Ohio‎$g‎Vol. 51, nº 8, August 1990 ; p. 420-426