Document Detail


Performance of dust respirators with facial seal leaks: I. Experimental.
MedLine Citation:
PMID:  3687728     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The ability of representative half-mask and single-use respirators with facial seal leaks to provide protection against aerosols was evaluated by experimental measurement. Respirators were mounted on a manikin in a test chamber and operated at seven steady flow rates over the range of 2 to 150 L/min. Samples of polydisperse and monodisperse aerosols were taken from inside and outside the respirator and analyzed by a calibrated optical particle counter over the particle-size range 0.1 to 11.3 microns. Measurements were made separately for filter performance as a function of particle size and flow rate, and simulated leak performance (penetration) as a function of particle size, pressure drop, and leak size. Flow rate vs. pressure drop measurements were made for all filters and leaks tested. For a given leak condition the percentage of the total flow traversing the leak varied several fold over the usual range of airflow rates through a respirator. Aerosol penetration was found to depend strongly on particle size and flow rate for filters, and to depend strongly on particle size and less strongly on pressure drop for leaks. One can conclude from these measurements that the aerosol-size distribution inside a respirator will nearly always be significantly different from that outside the respirator.
Authors:
W C Hinds; G Kraske
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American Industrial Hygiene Association journal     Volume:  48     ISSN:  0002-8894     ISO Abbreviation:  Am Ind Hyg Assoc J     Publication Date:  1987 Oct 
Date Detail:
Created Date:  1988-01-13     Completed Date:  1988-01-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0371160     Medline TA:  Am Ind Hyg Assoc J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  836-41     Citation Subset:  IM    
Affiliation:
University of California Southern Occupational Health Center, UCLA School of Public Health 90024.
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MeSH Terms
Descriptor/Qualifier:
Aerosols
Dust / analysis*
Equipment Failure
Filtration / methods
Humans
Masks / standards*
Particle Size
Protective Devices / standards*
Respiratory Protective Devices / standards*
Grant Support
ID/Acronym/Agency:
1RO1 OH01595/OH/NIOSH CDC HHS
Chemical
Reg. No./Substance:
0/Aerosols; 0/Dust

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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