Document 3e1kNG8v9pEVQL7kxaKVdNOwy

FILE NAME: RT Vanderbilt (RTV) DATE: 1973 Aug 28 DOC#: RTV178 DOCUMENT DESCRIPTION: Memo Re Determination of Chrysotile by TEM in Commercial Talcs r^ fe. Johns-Manvie CONFIDENTIAL - LIMITED DISTRIBUTION To; R. S. Lamar R&D Ctr Dolo; August 28, 1973 FfOli: V, E. Wolkodoff - RfiD Ctr Copies: Subject; DETERMINATION OF CHRYSOTILS 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 typical 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 Mistron 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-Super Frost Johnson and-Johnson, Vermont Cyclo-Sorb Johnson and Johnson Baby Powder CRMC-HT-TALC-000099 s. Page R, 2 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 ', yJlkeC 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 CRMC-HT-TALC-000100 Table No. 1 t IDENTIFICATION AND TEM DATA ON COMMERCIAL TALCS Sample No.' 1 Product Yellowstone, United Sierra, Montana Reference No. D.M. Inc. No. C-38 tem Plate Numbers 2144 a; b, and; r~ w 2 Mistron Vapor, United Sierra, Montana D.M. Ine. No'.. C-104 * 2145 A, B, and c 3 Mistron Monomix, United Sierra, Montana D.M. Inc. No. C-25 214 6' A, B, and c . 4 Mistron Super Frost, United Sierra, Montana D.M.'Inc. No. n-124 2147 A, B, and.c 5 Fibrene C-40, United Sierra, Death Valley D.M. Inc. No. C-108 2148 A , B , and c 6 7 8 9 10 Charles Pfizer. Talc/for.paper industry Asbestine 5X, International Talc Nytal 230, R. T. Vanderbuilt Envtal 599, Englehard Johnson & Johnson, Green Mt., Vermont D.M. Inc. No. C-68 . D.M. Inc. No. C-95 D.M. In:. No. C-109A D.M. Inc. No. C-13 D.M. Inc. NO. C-14 2149 A, B, and c i 2150 A, .8, and C i! 2151 A, B, and c ! 1 ! 2152 A, B, and c 2153 A, B, and c 11 12 13 14 NOTE: Italian Talc e Grafite Val Chisone J-M No. RE-73166-1S 1 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. 70-34 2155 A, B, and c l " 1 D.M. Inc. No, Std. 70-'33 t . \ S 1 J-M No. RC-73219-1 ! 2156 A, B, and c 2157 A, 3, and r All TEM prints are at magnification of 20,000 X (2 era equals 1 micron}. CRMC-HT-TALC-OOO 02 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 Contamination 0 2 Mistron Vapor 0 -- 0 3 Mistron Monomix 1 4 Mistron Super Frost <100 -- Contamination 0 trace? 5 Fibrene C-4-0 1500 -- 5-10% 6 Pfizer 7 Asbestine 5X 3 Mytal 300 0 >3000 ^5000 . -- ----- -- - 0 30% present 9 Emtal 599 0 -- 0 10 J and J, Vermont <1000 May be 0 Contamination 11 Italian Cosmetic 3000 -- trace? . 12 , Cyclo-Fil 0 20-30% 13 Cyclo-Sorb 14 ; J and J Baby Powder . (li approx. 1000 approx. 1000 May be Contamination . J May be ! Contamination 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. CRMC-HT-TALC-000101