Document L1b87vwaK8Lv834Q90rMx2g3

~.~.,M~""~::1 Johns-Manville CONFIDENTIAL - LIMITED DISTRIBUTION To: R. S. Lamar - R&D at%' DMo: Sep~ember . , 1973 Fromt V. E. Wolkodoff - RaD au Cop...: Subiect: PETROGRAPHIC CALCUUflION 01' CHRYSOTILE AIm '!REMOL:tU PAMILY PIBBRS IN COHMBRCIltL TALeS BY FDA PROPOSAL 01' AUGUST 20, 1973 1. The technique is the same as outlined to you in m letter of August 27, 1973. 2 'l'h(! $P\P1.., ..~(:\ .tp.~...,~ . ~.s1;!l9'E!stlldted by ~ and report.e4 to you on .Aupst'.a8~1'''3. 3. The results ue auuaar&.e4in'!ableNo. 1. jmw cc: J. M. Sharratt - 2 West W. L. VanDerbeek - 2 west P. A. Martinson - 2 West RyM. Hutchinson - 2- tfest T. L. Pundsack - R&D atr s. Spell - R&D Ct%' w. C. Streib - R&D Ctr J. P. Leineweber - R&D Ctr G. R. Bell - R&D Ctr Notebook No. 4393, pp. 13-27 CAM-265 CRMC-Talc-Micro-001352 Table 1 Petrographic-Crystallographic Determination 1 FDA Method, For Asbestos Fibers in Commercial Talcs Product and Reference No. Yellowstone, United Sierra, Montana C-38 Mistron Vapor, Un ra, Montana Mistron Monomix, United Sierra, Montana C-2S Mistron Super Frost, United Sierra, Montana C-124 Fibrene C-400, United Sierra, Death Valley C-108 Charles Pfizer C-68 Asbestine 5X, International Talc C-95 Nytal 300, R. T. Vanderbuilt C-190A Emtal 599, Englehard C-13 Johnson & Johnson, Green Mt., Vt. C-14 Italian Talc e Grafite Val Chisone RE-73166-18 J-M Cyclo-Fil Std. 70-34 J-M Cyclo-Sorb Std. 70-33 -----J-o-h-n-s-o-n--&--J-o.-h-n-s-o-n--B--ab-y-_P.-o-w-d-e-r--------------- RC-7l219-1 No. of Chrysotile Fibers/mg o 89 90 1398 o 17100 22175 o o 1880 o o o-=~--,--- No. of Tremolite Fibers/mg o o o o 6542 o 16800 17135 o o o 34890 12426 o CRMC-Talc-Micro-001353