Document LgQ5d0pXKXDvkGeQyQv8dR2dg

FILE NAME: Talc (TALC) DATE: 1973 Aug 28 DOC#: TALC452 DOCUMENT DESCRIPTION: Confidential Memo RE Determination of Chrysotile by TEM in Commercial Talcs :u.f\*y>.'^t4e.ir:"^^"i*'r^'. Johns-ManvS!!e t\y.l!'~^, (ij hil^J ^i LrW^* rlis ^ i' V//* T > }*Sw'r W^i SW^WO*^ vC- 1'*0*'* ^* WCWC .CONFIDENTIAL - LIMITED DISTRIBUTION ' To; r . S. Lamar - RSD Ctr dmoj August 28, 1973 Ffonu V, E. Wolkodoff - RSD Ctr ' Copies: ` ' ' Subject: DETERMINATION OF CHRYSOTILE BY TEM IN COMMERCIAL. TALCS 1. Fourteen commercial.talcs were examined by TEM^for the presence of chrysotile. The samples are identified in Table No. 1, which also lists individual TEM plate num bers. 2. The presence or absence of chrysotile is based on scanning from 20 to 25 fields for each sample. Three electron . micrographs were taken of topical fields in each sample. These electron micrographs, a total of 42 prints, are attached. . 3. The results are listed in Table No. 2. If chrysotile was detected in a sample, a percentage is listed and, at best, is qualitative. However, these percentages are relative to each other. Data on tremolite or tremolite-like amphibole are also listed but are based mainly on qualitative petrographic work as a frame of reference for future optical work by recent FDA proposal. 4. Results: A. Chrysotile was not detected in: . Mistron Vapor , MisPron Monomix - Pfizer . . Eir.tal 599 . . Cyclo-Fil . . .... B. If the chrysotile content was determined to be 1000 ppm or less, the chrysotile at this stage of- the study has to be considered a contaminant. These include: . Yellowstone . Mistron-SuperFrost Johnson and Johnson, Vermont Cyclo-Sorb . . Johnson andJohnson Baby Powder CRMC-HT-TALC-000099 Page 2 R, s. Lamar . . . August 28, 1973 . C. The only samples, which-contain chrysdfcile believe., to be part of the mineralgica! system at this . stage of the study are: ' Fibr.ene C-400 Asbestine 5X - . ' Nytal ^00 . " Italian Cosmetic Talc . 5, In many of the uxectron micrographs, distinctly fibrous material appears, even though chrysotile and tremolite -are not reported.. These "fibers" are talc verified, either during process of scanning or by reviewing TEM plates under'a binocular microscope. i ', y J lk e C V. E. Wolkodoff :jmw Attachment cc: j. M. Sharratt - 2 West W. L. VanDerbeek - 2 West .p. A. Martinson ^ 2 West v M. Hutchison - 2 West . L. Pundsack - R&D Ctr S. Spell - R&D Ctr W. C. Streib . - R&D Ctr J. P. Leineweber - R&D Ctr Notebook No. 4393, p.' 4,5 C R M C -H T -T A L C -0 0 0 100 Table lo. 1 . IDENTIF ICATION AND TEM DATA 01 COM 4r_.P.CIAL-- i---ICS Sample No.' 4 10 11 12 13 14 Product Yellowstone, United Sierra, Montana Mistron Vapor, United Sierra, Montana Mistron Monomix, United Sierra, Montana Referenee No D.M. Xnc . No. C -38 D.M. Ine. No'.. C-104 D.M. Inc. No. C-25 ~Mstron Super Frost, United Sierra, Montana) D.M. Inc. No. r-124- ' ' TEM pia te Numbers 2144 A, B, and C 2145 A, B, and C 214 6' A, 3 , and C 2147 A, 3 , and,C "pibrene C-400, United S i e r ^ T Death Valley "Charles Pfizer Talc -for paper industry D.M- Inc. No. C 108 D.M. Inc. No. C-68 . D.M. Inc. No. C-95 2148'A, B, and C 2149 A, B, and C 2150 A, .8 , and C ' Nytal 200, R. T. Vanderbuilt Emtal 599, Englehard Johnson & Johnson, Green Mt., Vermont Italian Talc e Grafite Val Chisone D .M. In '. No. C-09A D.M. Inc. No. C-13 i D.M. Inc. No. C-14 J-M No. RE-73166-1S j 2151 A, B, and C ! .j 2152 , B, ana L _ j 2153 B, and n 2154 A,. B, and C Cyclo-Fii, J-M for paper Cyclo-Sorb, J-M for paper Johnson & Johnson Baby Powder D.M. Inc. No. Std. 70-3-4 ,. 2155 A, 3 , and C .._____________ L " D.M. Inc. No. Std. 70-33 2156 A, B, and C 1 . ____________ :----------- J - M No. RC-73219-1 2157 A, 3 , and r ^ 7 All t e m 'prints are" at magnificatlon of 20,000 X (2 cm equals 1 micron) CRMC-HT-TALC-000102 Table 2 Detection of Chrysotile by TEM in Commercial Talcs Sample No. Product % Chrysotile, by Volume, ppm Remarks on Chrysotile ' Tremolite % by Volume^- : 1 Yellowstone 500 2 Mistron Vapor 0 3 Mistron MOnomix ' 1 4 Mistron Super Frost <100 5 Fibrene C-4-0 1500 Contamination . -- -- - Contamination . -- 0 0 0 trace? 5-.10% 6 Pfizer ' ' 7 Asbestine 5X a Mytal 300 . . 9 r Emtal 599 10 J and J, Vermont 0 >3000 ^5000 . 0 <1000 -- ' . 0 ' . -' -- - '30% present --- ' 0 May be 0 Contamination 11 . 12 . 13 14 - . -.l Italian Cosmetic Cyclo-Fil Cyclo-Sorb J and J Baby Powder . 3000 . -- . 0 :-- - approx. 1000 May be Contamination ..... .... J ' approx. 1000 J May be . ! Contamination trace? 20-30% 5-10% 0 -* Although tremolite determination is not intent of this report, crude percentages (based mostly on petrographic examination) are presented to account for log-like fibers in.some of the electron micrographs, 'alike chrysotile, tremolite has no particular distinguishing feature other than morphological in some cases when examined by TEM. C R M C -H T -T A L C -0 0 0 101