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- W337143071 abstract "Respirators fitted with high-efficiency particulate (HEPA) cartridge filters are designed to remove dust, fumes, mists, and airborne particulate radionuclides. If these filters are to be reused, a Quality Assurance (QA) program must be established to ensure that filter efficiency remains greater than 99.97%. The standard method for performing QA testing is to challenge the filter with a thermally generated aerosol of 0.3-..mu..m-diam di-2-ethylhexyl phthalate (DEHP). Because of potential toxicological and other problems associated with the use of monodisperse DEHP, an investigation to study measured filter efficiencies on a HEPA respirator filter population, using several recommended replacement aerosols, has been conducted. Aerosols compared in this study were thermally generated di-2-ethylhexyl sebecate (DEHS), thermally generated DEHP, air-jet-generated DEHS, and air-jet-generated salt (NaCl). The study also focused on determining compatibility for parallel use of aerosols generated for respirator-fit testing for use in QA filter testing. Results indicate that a polydisperse air-jet-generated aerosol of DEHS can substitute for thermally generated DEHP as a method of providing QA testing of HEPA respirator filters and that equipment used in the study designed for respirator quantitative-fit testing can easily be modified to perform this function. 30 refs., 28 figs., 11 tabs." @default.
- W337143071 created "2016-06-24" @default.
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- W337143071 date "1984-12-01" @default.
- W337143071 modified "2023-09-27" @default.
- W337143071 title "Comparative study of HEPA filter efficiencies when challenged with thermal- and air-jet-generated di-2-ethylhexyl sebecate, di-2-ethylhexyl phthalate, and sodium chloride" @default.
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