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

Authors
Brosseau-LM; Ellenbecker-MJ
Source
Department of Environmental Science and Physiology, School of Public Health, Harvard University, Boston, Massachusetts :1-33
Link
NIOSHTIC No.
00192326
Abstract
Experiments were described which evaluated the predictive ability of tests using a silica (7631869) aerosol under conditions of steady flow for determining respiratory efficiency. Measurements taken of silica penetration at steady flow were reasonably predictive of silica penetration under cyclic flow. Mass penetration of silica under continuous flow conditions was typically less than 0.1 percent. In general, the penetration of silica under conditions of cyclic flow was about one and a half times as great as that measured under steady flow conditions. However, the same was not true for testing with asbestos (1332214) fibers under steady versus cyclic flow. Furthermore, the potential for exhalation valve failure under cyclic flow was also identified. The authors indicate that these results call for a reevaluation of the current NIOSH protocols for evaluating respirator performance. The authors urge the development of a NIOSH testing method for evaluating the life cycle performance of respirator components such as exhalation valves.
Keywords
NIOSH-Grant; Respirators; Personal-protective-equipment; Silica-dusts; Asbestos-dust; Filter-materials; Electrostatic-filters; Asbestos-fibers; Mineral-dusts; Air-flow; Aerosols
Contact
Environmental Sci & Physiology Harvard School of Public Hlth 665 Huntington Avenue Boston, MA 02115
CAS No.
7631-86-9; 1332-21-4;
Document Type
Final Grant Report
Funding Amount
134707
Funding Type
Grant
NTIS Accession No.
PB90-154691
NTIS Price
A04
Identifying No.
Grant-Number-R01-OH-02154
NIOSH Division
OEP
Priority Area
Respirators
Source Name
Department of Environmental Science and Physiology, School of Public Health, Harvard University, Boston, Massachusetts
State
MA
Performing Organization
Harvard University, Boston, Massachusetts
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