Document 0JgJgaqLg63o0Ev0e2Lxx4g8n

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 * ' ' ' J-s. `'->` - k i 'N*' ^'>' R* S. Liun&tt' - R&D V. K, Wolkodoff - RM) a.i.; October 23, 1971 Distribution on Reverse Side T W A3D SBLECTED AREA DIFFRACTION PATTERNS OF ASBESTOS MINERALS IN FOI TALC SAMPLES PRODUCED L R. 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 dlff?,,cclon patterns, the presence of chrysotile, anthophyllite and tremolite in all the R. T. Vanderbilt talcs designated Nytal 200, Nytal'itGO, Asbestine 3X, and Asbestine 325a (please refer to my letter of October 9, 197^, 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 EMI/-3B model. 2. Table No. 1 not only identifies samples, but also identifies all Tr*M prints and selected area diffraction patterns of the 33 prints attached to this letter. The TEM plates are always on file. The microscope constant (L A) was derived by averaging 21 microscope constant values based on lines of Au and Pd. The microscope constant is: To calculate d-spacing in Angstrom units, the following formula was used: L A (A cm) spot pair radius (cm) 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 in Table No. 3 and appropriate attached electron diffraction patterns. . At tachmente t f A n ' n r i f i A y 1, h f f h CRMC-HT-TALC-000048 Distribution: R, P, Carter* , - Un K. M, Pe* er ' - HN Paul Kotin, M.D, ~ 1<N W. B, FeitJie . - iiR. F. J. Solon, Jr, '- G, L, Swallow ~ UN A. C. F. Finkblner, ""ir - ?W t. A. McKinney - 5W K, R. Keefe* - 2W P, A. Martinson - 2W C. J. Sulewski 2W ' W. L. VanDerbeek - 2S R. G, Riede ' 2S " r Fr L, Pundaaek J, P. Leineveber* W. C, Streib S. Spell* R. S. Lamar* V. E. Wolkodoff* *Prints attached only to those names followed by asterisk. CRMC-HT-TALC-000049 msmmmmsss TABLE 1 TEM Tablatior of Micrographs and Selected Area Diffraction Patterns of Four Talc Sawples From B. T. Vanderbilt Co, '/anderbilt No * per. Ijrnntion 1 RC 71,255-1 Nytol 2Q0 2 HC 7**255-1 Nytal 200 3 RC "`255-1 Nytal 200 t RC 71*255-1 Nytal 200 TEM. Plate No., Magnification 2301.., 11.000X 2317A, 16.00X 2305A, 22,000X 5 RC 71255-1 Nytal 200 0 RC ji.255-1 Nytal 200 2306a , 22.000X 7 RC 7A255-1 Nytal 2-0 . 2307A, 22 ,OOOX s KC 7**255-1 Nytal 200 Solevted Area Diffraction Pattern, 35X 2305B 2306B 2307B Remarks Chrysotile fiber Pattern is of vicest fiber in 2305A, Chrysotile Anthophyllite fiLer Anthophyllite fiber in 2306a . Tremolite fiber Tremolite fiber in 2307A 5 . RC 71*255-2 Nytal 1*00 10 714255-2 Nytal 1*00 RC 7 '-255-2 Nytol 1*00 L2 ac 7;-255-2 Nytol 1*00 . .1/I - RC 7t255-2 Nytal 1*00 ",/ RC 7255-2 Nytol tOO 15 KC 71+255-2 Nytol 1*00 io RC 7t255-2 Nytal 1*00 2302D, 11,OOOX 2318C, 1 6 ,OOOX 2308A, 22,000X 2309A,- 22.000X 2310A, 22,000X 2308B 2309B 23103 Chrysotile fiber Pattern of Cnryroti .. above Antbophyll* V- Ci n-:.-r Pattern of Atitnophyi above Tremolite fio-r Pattern of Tremo-.j<* above RC 7`*255-3 Asbestine -J. HC 71255-3 Asbestine 3X RC 71255-3 Asbestine 3X 233D, 11.000X '239D. 16,000X 2311A, 22?000X y.o P.C 71*255-3 Asbestine 3X kw 7 t2 5 3 -3 Asbestine 3X \>r. 71255-3 Asbestine 3X 2312A, 22*,000X 7 L2 5 5 -3 Asbestine 3X 2313A, 22.000X ,ii, HC 7t255-3 Asbestine 3X 2311B 2312B 2313E. C h r y s o tile f ib e r or. bottom _ Pattern 01' Chrymi/- above Anthophyllite 7: ' P a ttern o f Ani n - C - above Tremolitc fit'"-"/ Pattern o f Tronic"; ; ' above 711255-1* Aabcstine 325 230tA, 11,OOOX 26 Asbestine 325 2322A, l6,000X F ib e r i s corr.lr.;;ietl c tile and Amphibole CRMC-HT-TALC-000050 (2) Table 1 continued Vanderbilt Lao. No. Designation * . ' Selec.ad Area TEM Plate Diffraction No Magnification Pattern, 35% Pcfflarkjl 27 riC 71255-1 Asbestine 325 - pa HC 7t255-t Asbestine 325 23llA, 22 ,.000X 29 HC 71255-1 Asbestine 325 - ' 30 .:C 71255-1* Asbestine 325 2315A, 22 ,OOOX uk`rN. 7^255-1 Asbestine 325 - , 32 P.v 7l255~l Asbestine 325 2316a , 22.000X 33 uc 71255-1+ Asbestine 325 - 2322B 231^+B 2315B " 2316b Chryeotile pattern superimposed on Arnpiiibole pattern Chryeotile fiber Pattern of Chryeotile above Longest fiber is Anthophyllite Pattern of Anthorl.y:i above Largest fiber in Tremolite Pattern of Troinoiitc above CRMC-HT-TALC-000051