Identification of faceseal leak sites on a half-mask respirator.
Oestenstad-RK; Perkins-JL; Rose-VE
Am Ind Hyg Assoc J 1990 May; 51(5):280-284
A system for identifying respirator faceseal leak sites was described. The technique consisted of exposing the respirator placed on a manikin or worn by human subjects to an aerosol consisting of 4- methyl-7-diethylaminocoumarin (MDC) particles at concentrations of 18 to 50mg/m3 in a specially designed test chamber. MDC was a fluorescent whitening agent that absorbed long wave ultraviolet radiation and converted it to blue light. Photographs using ultraviolet light were taken before and after exposure. Any leak sites appeared on the photographs as white areas. The system was tested with a United States Safety Series 200 Half Mask respirator. Sufficient amounts of MDC were deposited so that leaks around the faceseal could be detected. Experiments used to optimize the test system were described. The authors conclude that respiratory faceseal leak sites can be identified with the MDC aerosol. The system can be used to determine the distribution of leak sites and shapes for various groups of wearers and respirator types. Information obtained by the system may be useful for identifying an association of critical facial dimensions with respirator fit factors.
NIOSH-Publication; NIOSH-Grant; Respirators; Laboratory-testing; Leak-detectors; Respiratory-protective-equipment; Aerosol-particles; Equipment-reliability; Visual-aids
Environmental Health Sciences Univ. of Alabama at Birmingham School of Public Health Birmingham, AL 35294
American Industrial Hygiene Association Journal
University of Alabama at Birmingham, Birmingham, Alabama