Document n9GbZnDmZ2O6L1xXdjJEvNqx6

FILE NAME Talc TALC DATE 1973 Aug 28 DOC TALC452 DOCUMENT DESCRIPTION Confidential Memo RE Determination of Chrysotile by TEM in Commercial Talcs te AE Tn RIE AMEE Tod Ra a Le a en Ea nere an 8/29/208/029/2008/29/20 88/2/92/92/0028/290/2000 Os JM Manville - II nforn nal fInfo orInnaflr orInfnornaallnCa oCorespondencer espondencl eCoresCpoondrenrceespoCoresnpondedc encCeorCorreesspopndeoncne denCcoerresCporornedseponncdeence Correspondence Corespondence Corespondence Corespondence Corespondence Correspondence CONFIDENTIAL - LIMITED DISTRIBUTION - To R. S. Lamar ~ R Ctr Date August 28 1973 ) , From V. E. Wolkodoff = R Ctr . Copies 7 1) | Subject DETERMINATION OF CHRYSO ILEBY TEM IN COMMERCIAL TALCS talcs were 1. Fourteen commercial examined by TEM for the presence of chrysotile The samples are identified in 1 Table No. which also lists individual TEM plate numa bers 2 . The presence or absence of chrysotile is based on scanning from 20 to 25 fields for each sample Three electron micrograpwehrse 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 relative to each other Data on tremolite or are are tremolite amphibole also listed but are based work mainly on qualitative petrographic 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 Emtal 599 . - Cyclo B. If the chrysotile content was determinetdo 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 = Johnson 5 |. Johan nds Joo hnsn on Baby Powder 000099 ae Lo Page 2 R. S. Lamar . mo 7 a August ot 28 1973 oo C. The only samples which contain chrysotile believe to bepart of the mineralogical system at this stage of the study are Fibrene 400 Asbestine 5X Nytal 700Cosmetic Italian Cosmetic Talc 5. Inmany of the electron 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 a under binocular microscope V. E. Wolkodoff - .jmw Atachment . Attachment CC - J. M. Sharratt - 2 West- W. L. VanDerbeek- 2 West . .P A. Martinson - 2 West S. FM. Hutchison - 2 West LF . Pundsack- R Ctr Speil | - D Ctr W. Streib -: - R Ctr J. P. Leineweber - D Ctr Notebook No. 4393 p 4,5 000100 Table No. 1 IDENTIFICATION AND TEM DATA ON COMMERCIAL TALCS Sample . Product Reference No. Plate Numbers | No. 1 Yellowstone United Sierra Montana D.M. Inc. No. 38 | 2144 A B and C Montana D.M. Inc. No. 104 2145 A B and C 2 Mistron Vapor United Sierra Monomix Inc. | A C Mistron United Sierra Montana D.M. No. 25 2146 B and 3| Sierra and 4 Mistron Super Frost United Montana D.M. Inc. No. 124 Fibrene No. 7 400 United Death Valley D.M. Inc. 108 Sierra 5 , 2147 A B 2148 A B and C | 2149 60 Charles Pfizer Talc for paper industry International 7 Asbestine 5X Talc 8 Nytal 300 R. T. Vanderbuilt D.M. Inc. No. 68 . D.M. Inc. No. 95 . D.M. In No. 109A A B and C 2150 A B and C ~ i 2151 A B and C 9 Emtal 599 Englehard 10 Johnson & Johnson Green Mt. Vermont 11 Italian Talc e Grafite Val Chisone 12 Cyclo M for paper CRM 13 Cyclo M for paper 14 Johnson & Johnson Baby Powder | _ D.M. Inc. No. 13 2152 A B and C D.M. Inc. No. 14 M No. 73166-18 2153 A B and C 2154 A B and C D.M. Inc. No. Std 70-34 | D.M. Inc. No. Std 70-33 | M No. 73219-1| : 7 2155 BB and C 2156 A B and C 2157 A B and C ~: - 0 12TALC NOTE All TEM prints are at magnification of 20,000 X 2 cm equals 1 micron Table 2 Detection of Chrysotile by TEM in Commercial Talcs Product _. Yellowstone Mistron Vapor Mistron Monomix Mistron Super Frost Fibrene 4-0 | Pfizer .7 Asbestine 5X .8 Nytal 300 9 Emtal 599 10 J and J Vermont 11 Italian Cosmetic 12 | Cyclo 13 : Cyclo fe, a 14 J and J Baby ob, - a Powder * Chrysotile by Volume ppm 500 Remarks on Chrysotile Contamination Tremolite % by Volumel an) 0 0 100 | ainned anak Contamination O 0 trace 1500 0 | ~~~ 5-10 0 33000 5000 , 0 1000 i ~n ~~ -~ || May be Contamination 30 present 0 0 3000 0 oon == trace 20-308 approx 1000 | May be a | Contamination approx 1000 "| May be || Contamination 5-10 0 . 1 Although tremolite determination is not intent of this report crude percentages based mostly on petrographic examination are presented to account for like fibers some of the electron micrographs Onlike chrysotile tremolite no particular distinguishing feature other than morphological in some cases when examined by TEM 000101