Aerosol penetration behavior of respirator valves.
Division of Environmental and Occupational Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota 1995 Apr; :1-46
In the first of two projects, a telephone survey of 28 company respiratory protection programs was used to evaluate their inspection cleaning, maintenance, and storage requirements. Most of the companies met the requirements in CFR 1910.134 and ANSI Z88.2- 1980. Needs identified included inspecting respirators for worn and deteriorated parts, making replacement parts easily available, regular cleaning, and hands on practice as part of training. In the second project, laboratory experiments were performed to evaluate aerosol penetration and flow leakage through respirator valves. Work rates of 415 and 622 kilogram meters/minute and 0.3 and 0.8 micrometer particle sizes were used in tests. Particle penetration through all exhalation valves was on the average 0.04% for the large particle size and 0.02% for the smaller particle size. An analysis of variance showed that only particle size and lot significantly affected exhalation valve penetration. Work rate and manufacturer were not significant factors. The author notes that limitations of the design of the experimental apparatus prevented accurate measurement of particle leakage through inhalation valves. Flow leakage through inhalation valves was not significantly changed by 8 hours of cyclic stress at either work rate.
NIOSH-Grant; Respirators; Personal-protective-equipment; Respiratory-protective-equipment; Industrial-hygiene
Environ & Occupational Health University of Minnesota 420 Delaware St Se, Box 197 Um Minneapolis, MN 55455
Final Grant Report
NTIS Accession No.
Division of Environmental and Occupational Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota
University of Minnesota Twin Cities, Minneapolis, Minnesota