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Aerosol penetration through respirator exhalation valves.

Authors
Bellin-P; Hinds-WC
Source
Am Ind Hyg Assoc J 1990 Oct; 51(10):555-560
NIOSHTIC No.
00196792
Abstract
The nature and extent of exhalation valve leakage (back leakage of outside air through the exhalation valve as it closes and seals during inhalation) was investigated. An MSA Comfo-II half face mask respirator sealed to a manikin and a dual piston mechanical breathing machine were used for aerosol penetration tests. Aerosol particle sizes tested were 0.5, 2, 4, and 8 micrometers. Copper wires of known thickness were placed in contact with the exhalation valve seat to simulate valve defects. Thicknesses of 0.03, 0.08, their exterior surface were also tested. Introduction of a 0.25 millimeter wire increased aerosol penetration by 100 to 1000 fold. Aerosol particle penetration was strongly dependent on particle size. Penetration for wire induced exhalation valve leaks was as high as 1.1%. The effect of paint and/or dust accumulation on a valve was comparable to that of wire induced leaks, 0.2% to 0.6%. The authors conclude that proper inspection of all respirator components is a necessary component of a respiratory protection program.
Keywords
NIOSH-Publication; NIOSH-Grant; Respirators; Training; Safety-practices; Safety-equipment; Respiratory-protective-equipment; Personal-protective-equipment
Contact
Inst of Safety & Systems Mgmt University of California University Park Los Angeles, Calif 90089-0021
CODEN
AIHAAP
Publication Date
19901001
Document Type
Journal Article
Funding Amount
4533600
Funding Type
Grant
Fiscal Year
1991
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T15-OH-07214
Issue of Publication
10
ISSN
0002-8894
Priority Area
Respirators
Source Name
American Industrial Hygiene Association Journal
State
CA
Performing Organization
University of Southern California, Los Angeles, California
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