Document 4anwd1qZ0Gvv1GL4K6arY67V

FILE NAME Talc TALC DATE 1974 Oct 23 DOC TALC468 DOCUMENT DESCRIPTION Memo RE Diffraction Patterns of Asbestos in Four Talc Samples from RT Vanderbilt with Sample Results i JohnsManville Internal Internal Concopo Intern Internaa l Intel rnal Internal Concopo Lo Internal Internal Internal Internal Internal ConcopoConcopo Concopo R. B. Lamar- & . from V. E. Wolkodorf ~ & Date October 23 1974 Cups Distribution on Reverse Side Daly at TEM AND SELECTED AREA DIFFRACTION PATTERNS OF ASBESTOS MINERALS IN FOUR TALC SAMPLES PRODUCED L 3. T. VANDERBILT COMPANY 1. At your request I was able to contract time on the Philips 200 electron microscope at Denver Research Institute to confirm by selected area diffraccion patterns the presence of chrysotile anthophyllite and tremolite in all the R. T. Vanderbilt tales designated Nytal 200 Nytal 400 Asbestine 3X and Asbestine 325x please refer to my letter of October 9 1974 which is based basically on FDA optical methods and the use of our RCA electron microscopes to confirm chrysotile It was felt that selected area diffraction patterns of the asbestos minerals using the Philips 200 would lend positive identification - & type of analysis which cannot be done on our RCA EMU model 2. 2. TaTable ble No. I not only identifies samples but also identifies aallll TEM prints and selected area diffraction patterns of the 33 prints attached to this letter The TEM plates are always on file The microscope constant LA LA was derived by averaging 21 microscope constant values based on lines of Au and Pd The microscope constant is LA = 4.451 ^ cm -0.003 To calculate spacing in Angstrom units the following , was used spot LA pair pair ; ^ ^ cm cm radius = spascpaicnig ng f f f formula 3 Chrysotile anthophyllite and tremolite were all found in each of the four R. T. Vanderbilt talc samples Particular data for each sample are found Table No. 1 and appropriate attached electron patterns Wolku- Wolku- 7. E. WolkodoffWolkodoff jc Attachments oe MASSAA klek nan | RAZAL 000048 Distribution' R. P. Carter 2. M. Fer er Paul Kotin M.D. W. B. Reitze F. J. Solon Jr. G. L. Swallow 4N as ~ AN ~ 4N AN - . - ee 4N - 4N A. F.F. Finkbiner TII 1. A. McKinney H. R. Keefe - SW ~ 5W 2W ' P. A. Martinson C. J. Sulewski ~ 2W - 2W W. L. VanDerbeek - 25 L. L. Pundsack J. P. Leineweber W. C. Streib S. Speil R. S. Lamar V. E. Wolkodoff. , R. G. G. Riede 2S eee ar a Prints attached only to those names followed by asterisk _ 000049 TABLE 1 TEM Tabulatior of Micrographs and Selected Selected Area Diffraction of Four Tale Samples From T. T. Vanderbilt Co. Patterns No. i @ 3 La Lab No. Vanderbilt Vanderbilt Designation Designation RC 74255-1 RC 74255-1 RC 74255-1 RC 74255-1 Nytal Nytal Nytal Nytal 200 200 200 200 Nytal 200 Nytal 200 10 RC 74255-1 Nytal 2-0 | 8 RC 74255-1 Nytal 200 TEM Plate No. Magnification 2301 2317A 2305A 11,000X 16,000x 16,000x 22,000X 22,000X 2306A 22,000X 22,000X 2307A 22,000X 22,000X Selected Selected Area Diffraction Pattern 35X Remarks Chrysotile fiber Pattern is of widest fiber in 2305A Chrysotile Anthophyllite fiber Anthophyllite fiber in 2306A | Tremolite fiber Tremolite fiber in 2307A Gg | RC 74255-2 Nytal 400 10 aA | 12 RC 74255-742255-2 Nytal 400 NC 7255-2 Nytal 400 RC 74255-2 74255-2 Nytal 400 | 13 RC 74255-2 Nytal 400 i. RC 74255-2 Nytal 400 15 KC 74255-2 Nytal 400 af RC 74255-2 Nytal 400 2302D 23180 2308A 11,000X 11,000X 16,000X 16,000X 22,000X 22,000X 2309A 22,000X 22,000X 2310A 22,000X 22,000X Chrysotile riber Pattern of Chrysotirn above Anthophyllite liber Pattern of Anthophyllit Anthophyllit above Tremolite fi Pattern of Tremoli above Asbestine 3X Asbestine 3X Asbestine 3X 2303D 2319D 2311A 11,000X 16,000X 16,000X 22,000X 22,000X 20 RC 74255-3 Asbestine 3X wi "i RC 74255-3 Asbestine 3X 2312A 22,000X , ti 74255-3 Asbestine 3X 22,000X RC 74255-3 Asbestine % 2313A 22,000X 5 ie RC 74255-3 Asbestine 3X = Chrysotile fibes on bottom Pattern of Chent above | Anthophyllite fiber Pattern of Aniiep hits chy above Tremolite fiber Pattern of Tromel i: above 07425 -4 074255-4 Asbestine 325 2304A 11,000X 11,000X 2269 RG 74255- 74255-: Asbestine 325 2322A 16,000X 16,000X Fiber is comin led Cary tile and Amphibele 000050 - Table 1 continued ; - No. 27 28 29 30 31 32 33 Vanderbilt Lab No. Designation RC 74255-4 Asbestine 325 ve - TEM Plate No. Magnification - Selected Selected Area Diffraction . Pattern 35 2322B RC 74255-4 Asbestine 325 RC 74255-4 Asbestine 325 2314A 22,000X < ne NC 74255-4 Asbestine 325 RC 74255-4 Asbestine 325 2315A 22,000X , . RC 74255-4 Asbestine 325 2316A 22,000X' RC 74255-4 Asbestine 325 =~ 2314B : - . 2315B ' ~ 2316B Remarks | Chrysotile pattern superimposed on Amphibole pattern Chrysotile fiber Pattern of Chrysotile above Longest fiber is Anthophyllite Pattern of Anthophy bite above Largest fiber is Tremolite Pattern of TremolitTremeolite above CRMC