Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Polystyrene Latex Sphere Filter Efficiency as a Function of Particle Size and Flowrate.

Authors
Myak-RD; Moyer-ES
Source
NIOSH 1984 Sep:38 pages
Link
NIOSHTIC No.
00185296
Abstract
The effects of particle size and flow rates on respirator filter efficiency were studied. Filter efficiency for polystyrene latex spheres was investigated, and the aerosol particle size at which maximum penetration occurred. Various flow rates were used to evaluate the particle size region to determine if a shift in the maximum penetrating particle size occurred at these different flowrates. The study indicated that a particle size at which a minimum efficiency occurred does exist and varies as a function of flowrate and filter type, and varies by manufacturer within the same filter type. The study indicated that high efficiency filters gave excellent percent efficiencies when tested at or near the worst case conditions. Under these worst test conditions the dust and mist (DM); dust, fume and mist (DFM); paint, lacquer and enamel mist (PLEM) filter efficiencies were significantly lower than efficiencies required by the silica (7631869) dust, silica mist, and lead (7439921) fume filter efficiency tests. Minimum efficiencies for high efficiency filters occurred at larger particle sizes than for other filters. The authors suggest that the Sibata Respirator Model 634A Filter Efficiency Test System, which uses a light scattering detector, is not as sensitive for monitoring instantaneous filter efficiency when using a polystyrene latex (PSL) aerosol challenge as the dioctyl phthalate (DOP) and NaCl challenge with a CNC (count efficiencies) detector system, particularly at small particle sizes.
Keywords
NIOSH-Author; Aerosol-particles; Aerosol-sampling; Respirators; Respiratory-protective-equipment; Pulmonary-system; Personal-protective-equipment; Dust-control; Metal-fumes;
CAS No.
7631-86-9; 7439-92-1;
Publication Date
19840901
Fiscal Year
1984
NTIS Accession No.
PB89-165054
NTIS Price
A04
NIOSH Division
DSR;
Priority Area
Respirator Research; Respirators; Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Pulmonary-system;
Source Name
Division of Safety Research, NIOSH, U.S. Department of Health and Human Services, Morgantown, West Virginia, 38 pages, 18 references
State
VA; WV;
TOP