Collection efficiency of respirator filters challenged with monodisperse latex aerosols.
Brosseau-LM; Evans-JS; Effenbecker-MJ; Feldstein-ML
Am Ind Hyg Assoc J 1989 Oct; 50(10):544-549
The results of experiments in which the size specific performance of ten manufacturers' electrostatically charged dust/mist filters was determined using monodisperse latex spheres ranging from 0.1 to 2.0 micrometers in diameter were presented. These experiments were designed to provide data needed in the empirical modeling effort and to assist in selecting a subset of filters for use in subsequent experiments. Minimum efficiency occurred at or below the smallest size of 0.102 micrometers. Appreciable differences were found in the performance of filters distributed by the ten manufacturers. Filters produced by one manufacturer exhibited significantly lower collection efficiencies than other filters tested. Those produced by two of the manufacturers performed somewhat better than the others tested. Statistical analysis of Weibull transformed data using analyses of covariance and Tukey's significant different test allowed classification of the ten manufacturers into three performance categories. The strong dependence demonstrated by electrostatic filter efficiency on particle size, the variability of industrial aerosol size distributions and the recognition that lung dose depends on particle size as well as on mass concentration suggests that information about fractional penetration over a range of sizes would allow users to select filters appropriate for their particular operation.
NIOSH-Publication; NIOSH-Grant; Respirators; Personal-protective-equipment; Safety-research; Air-quality-control; Air-quality-monitoring; Air-sampling-equipment; Respiratory-protective-equipment; Filtration
Environmental Sci & Physiology Harvard School of Public Hlth 665 Huntington Avenue Boston, MA 02115
American Industrial Hygiene Association Journal
Harvard University, Boston, Massachusetts