Document 2JrnRjjg7YpKGDbx60kkVO2Z6

Z-19 *CV i.'* 3c: CC: 0. W. RAINES/H. E. R. B. ROOT, INTL C. L. HILLER, MATA P. J. MEYERS, GENEVA H. G. DRINKWATER, GENEVA J. KERR, GENEVA TO: R. L. Il'JRE, BEAUMONT W, 3. -1S-ER, CIRCLEVILLE V. Z-.iS, CLINTON C. SMITH, FAYETTEVILLE F. .. -AC I, FLORENCE H. - JE.'SCH, LOUISVILLE C. E. V.'E^'EYER, MATAGOROA G. E. 3-F3E, PONTCHARTRAIN W. E. T-CMAS, SABINE RIVER J. D. BA" DM, TECUMSEH J. G. pDilrilAVO, WASH. WORKS , 1984 V. D. HEMPHILL, CHAMBERS WORKS D. B. SCHIEWETZ, GLASGOW P. C. TANGEMAN, LA PORTE K. J. HUISMAN, DORDRECHT F. LENGLER, LUXEMBOURG N. BRUCE, MAYDOWN L. DE MAEYER, MECHELEN T. E. NEAVES, CHESTNUT RUN W. H. MARTIN, EXP. STATION V. M. MUELLER, DISA, GENEVA V. N. CHATTERTON, HEMEL HEMPSTEAD ASBESTOS WORKPLACE PRCT :CTION FACTOR STUDY Rep or: a::ached for your information. HAzAtSac/irs.msro gffMar \-.-r f-'im D'! 0r>nt DUP 0501559 DU 001298 K.itiUit.ifalfe; tun HCV M3 erru.s-toitot E. i. du Pont de Nemours & Company tNCO>**OllATK9 Haskell laboratory for Toxicology AND INDUSTRIAL MEDICINE P.O. Bex 50. ELKTCN ROAD NEWARK, DE--AWARE 197 1] CENTRAL RESEARCH AN2 DEVELOPMENT DEPARTMENT July 11, 1984 OSH COMV.:~T-IH ASBESTOS WORKPLACE PROTECTION FACTOR STUDY . . . INTERIM REPORT MR-5526 The first phase of a study to determine workplace performance of half-mas* air purifying respirators against asbestos is near compl: lor.. The purpose of this letter is to summarize preliminary findings of this study. A complete report will follow during 1984. This study involved collecting air samples from in ::'- and outside of respirators (single use and elastomer.s. while asbestos removal work was being done. The v/orkplace protection factor was then calculated as the ratio of the cutside ..concentration to the inside concentration. All volunteers received standard training and fit tests (3M saccharin procedure) at the beginning of' the study. Only respirators which passed the fit test were used in the workplace studv. Its to date are summarized in the attached table. Ir.ta- results from an ongoing laboratory study on filter eff-ti' :y Against asbestos at Los Alamos National Laboratory are also . .7 rved . A "tipsy and Occupational Health Division Bulletin will be issue- t: provide recommendations based on these results. Please pass this information on to appropriate people in your depart" sms and sites. SV.'C/c - r Att_. STEPHEN W. DIXON SECTION SUPERVISOR INDUSTRIAL HYGIENE DUP 0501560 DU 001299 WORKPLACE PROTECTION FACTORS (WPF) P.- = - i r = t or Number of Samples ao 7 3M o'... 11 3M 9 ?1J 7 Survivt ir, MSA F* 8 Surviv-.ir- MSA H** 6 Norm H 5 WPF Geometric Mean 52 760 - 1800 690 180 8 20 . rt* WPF/Range (/^7V 970 Los Alamos Penetration < 0.1 - 2.8% 110 - 3200 < 0.1% 550 - 5600 47 - 4200 < 0.1 - 2.0% 12 - 7900 12 - 3100 < 0.1% r-.c-es a dust and mist (non-high efficiency) filter i r tor. notes a high efficiency filter respirator. SWC - r Act.. it DUP 0501561 DU 001300