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Performance of dust respirators with facial seal leaks: I. Experimental.

Authors
Hinds-WC; Kraske-G
Source
Am Ind Hyg Assoc J 1987 Oct; 48(10):836-841
NIOSHTIC No.
00173880
Abstract
The ability of half mask and single use dust respirators with facial leaks to provide protection against aerosols was evaluated. The performance of six commercial respirators fitted with a variety of filters was evaluated by mounting them on a manikin in an aerosol test chamber and measuring aerosol number concentrations inside and outside the masks under steady flow conditions. Fourteen particle sizes utilizing oleic-acid aerosols ranging from 0.14 to 11.34 microns aerodynamic diameter and seven flow rates, 2 to 150 liters per minute, were used. Leak and filter penetration were measured separately. Leak penetration was measured by blocking the filter inlets and placing a wire between the sealing edge of the respirator and the manikin surface. Filter penetration was measured by sealing the mask to the manikin with hot melt adhesives. Pressure drops across the respirators were measured. Particle sizes inside and outside the masks were determined using an optical counter. Filter penetration depended strongly on particle size and flow rate. Leak penetration depended strongly on particle size, but was weakly dependent on pressure drop. Flow rate through the mask was strongly affected by leak size, being proportional to the 2.7 power of the leak diameter. The authors conclude that the aerosol size distribution inside a respirator will be markedly different from that outside. The data obtained in the study will be used as the basis of a model for predicting filter and leak penetration of dust respirators.
Keywords
NIOSH-Publication; NIOSH-Grant; Personal-protective-equipment; Respiratory-protection; Laboratory-testing; Simulation-methods; Aerosol-particles; Equipment-reliability
Contact
Environ and Nutritional Scis University of California 405 Hilgard Avenue Los Angeles, Calif 90024
CODEN
AIHAAP
Publication Date
19871001
Document Type
Journal Article
Funding Amount
430985.00
Funding Type
Grant
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-01595
Issue of Publication
10
ISSN
0002-8894
Priority Area
Control Technology and Personal Protective Equipment; Research Tools and Approaches
Source Name
American Industrial Hygiene Association Journal
State
CA
Performing Organization
University of California Los Angeles, Los Angeles, California
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