Workplace protection factor measurements on powered air-purifying tespirators at a secondary lead smelter: results and discussion.
Myers-WR; Peach-MJ III; Cutright-K; Iskander-W
Am Ind Hyg Assoc J 1984 Oct; 45(10):681-688
The workplace performance in a secondary lead smelter of the 3M W- 344 and the Racal AH3 powered air purifying respirators (PAPR) equipped with helmets and high efficiency filters was evaluated while worn by workers and while mounted on stationary manikins. A total of 12 workers participated in the study; each worker wore each model of PAPR twice. The lead concentrations measured inside the facepieces of both respirators ranged from 0.2 to 66 micrograms/cubic meter (microg/m3) geometric means being 4.9 and 5.5microg/m3 for the Racal AH3 and the 3M W-344, respectively. They both were significantly less than the OSHA specified lead exposure limit of 50microg/m3, as were the lead concentrations found during manikin testing. A correlation analysis between the paired workplace protection factor and the quantitative fit factor found no significant associations. The authors conclude that since the PARP protection factor classification of 1000 was originally based on quantitative fit factors, the lack of a demonstrated association between quantitative fit factors and workplace protection as found in this study, calls for additional research to determine a more suitable basis for protection factor classification.
NIOSH-Author; Workplace-studies; Lead-smelting; Air-purifying-respirators; Analytical-methods; Metallic-dusts; Respiratory-protective-equipment; Equipment-reliability; Exposure-limits; Filters; Air-flow; Foundry-workers
American Industrial Hygiene Association Journal