Document 2jpz9o3xYw3zZBbYg3VL6MBRg
FILE NAME: RT Vanderbilt (RTV)
DATE: 1974 Oct 23
DOC#: RTV260 DOCUMENT DESCRIPTION: J-M Memo RE TFM and Selected Area Diffraction Patterns of Asbestos Minerals in 4 RTV Talc Samples
Lamar- - R&D
D.uo October 23, 197^
Distribution on Reverse Side
< ADD SELECTED AREA DIFFRACTION PATTERNS OF ASBESTOS MINERALS IN FOU X SAMPLES PRODUCED BY R. T. VANDERBILT COMPANY
At your request, I was able to contract time on the Philips 200 electron microscope at Denver Research Institute to confirm by selected area diffraction patterns, the presence of chrysotile, anthophyllite and tremqlite in all the R. T. Vanderbilt talcs designated Kytal 200, Nytal ^00, Asbestine 3X, and Asbestine 3251 (please refer to my letter of October 9 5 197^, 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 - a type of analysis which cannot be done on our RCA EMU-3B model.
2 . Table No. 1 not only identifies samples, but also identifies all 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 (L A) was derived by averaging 21 microscope constant values based on lines of Au and Pd. The microscope constant is:
L A = A.A51 A cm t 0.003
To calculate d-spacing in Ang'strom units, the following formula was used:
L A (A cm)
= d-spacing (A)
spot pair radius ("cm")
Chrysotile, anthophyllite, aril tremolite were all found in each of
the four R. T. Vanderbilt talc samples. Particular data for each
sample are found in Table No.71 and appropriate attached electron
diffraction patterns.
y
V. E. Wolkodoff Attachments
NCTDROOX kh5k, pp. 82-8t
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Distribution:
R. P. Carter*
- Un
E. M. Fenner
- UN
Paul Kotin, M.D.
- UN
W. B. Reitze
- Lj;
F. J. Solon, Jr.
- UN
G. L. Swallow
- In
A. C. F. Finkbiner, III - 5W
J. A. McKinney
- 5W
H. R. Keefe*
- 2W
P. A. Martinson
- 2W
C. J. Sulewski
- 2W
W. L. VanDerbeek
R. G. Riede
J
- 2S 1 2S 1
F. L. Pundsack J. P, Leineweber* W. C. Streib S. Speil* R. S. Lamar* V. E. Wolkodoff*
1
^Prints attached only to those names followed by asterisk.
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TABLE 1
['EM Tabulation of Micrographs and Selected Area Diffraction Patterns of Four Talc Samples From R. T. Vanderbilt Co.
Vanderbilt
;*o.
Lab.' No. Designation
1 RC 7^255-1 Nytal 200
? RC 7^255-1 Nytai 200
3 PC 7'+255--1 Nytal 200
1 RC 7 L255-I Nytal 200
TEM Plate No. , Magnification
2301A, 11.000X 2317A, l6,000X 2305A, 22,000X
5 IC 7L255-1 Nytal 200 RC 7^255-1 Nytal 200
T RC 7^255-1 Nytal 2-0 S 1C' "L255-1 Nytal 200
9
;c 7R255-2 Nytal Loo
10
:c 7L255-2 Nytal 1+00
1 ! J. i
:C 7^255-2 Nytal L00
L2
:C 7^255-? Nytal L00
13 1C 7^255-2 Nytal LOO
It
:C 7L255-2 Nytal LOO
15 RC 7L255--2 Nytal LOO lo RC 7L255-2 Nytal LOO
2306a , 22,000X
2307A, 22,000X
2302D, 11,000X 2318c, l,000X 2308a , 22,00OX
2309A,J22,000X 23IOA, 22,000X
IT RC 7L255-3 Asbestine 3X RC 7L255-3 Asbestine 3X RC 7L255-3 Asbestine 3X
20 RC 7L255-3 Asbestine 3X
1 ; RC 7L255-3 Asbestine 3X 12 R^ 7L255-3 Asbestine 3X
,1*, RC 7L255-3 Asbestine 3X JvC 7`255-3 Asbestine 3X
2303D, 11,000X 2319D, i6,ooox 2311A, 22,000X '
-
2312A, 22 ,000X -
2313A, 22 ,000X ""
20 1C 7 L255-L Asbestine 325 23OLA, 11,00OX 26 RC 7L255-L Asbestine 325 2322A, l6,000X
Selected Area Diffraction
Pattern, 35%
Remarks,
2305B
2 30 6b 23O7 B
2308b
2309B
2310B
-
23IIB ; 23123 2313B
..
Chrysotile finer
Pattern is of vj desi
fiber in 2305A, !
Chrysotile
Anthophyllite lbbe r
Anthophyllite fibo V J.** o o o Au/xa*.
Tremolite fiber :
Tremolite flu r
2307A
1
7
Chrysotile fiber Pattern of Cnryrol above Anthophyllite fibv Pattern of Antr.ophj above Tremolite fiber
Pattern of Tren], above
--
-
Chrysotile file. <
bottom
Pattern of CRryno
above '
*
Anthophyllite fin
Pattern of An1:iu 1
above
Tremolite fiber
Pattern of
above
Fiber is teomiip !or tile and Amphibole
X
(2) Table 1 continued
Vanderbilt
TEM Plante
No. Lab. No. Designation No. , Magnification
27 RC 74255-U Asbestine 325 ]
25 RC 74255-U Asbestine 325 231^+A, 22.000X 29 RC 7U255-U Asbestine 325 -
50
7U255-U Asbestine 325 2315A, 22,000X
31 RC 7^255-4 Asbestine 325 * 'JO r-*^ 7^255-i* Asbestine 325 231A, 22.000X -,Jj5 RC 7^255-U Asbestine 325 -
Selected Area Diffraction
Pattern, 35X
Remarks
2322B
231^B -- 2315B 2316b
Chrysotile nnttern
superimposed or,
Amphibole pattern
Chrysotile fiber
Pattern of Chryooti.ii
above
Longest fiber is
Anthophyllite
Pattern of Ar.tMopby*
above
\
.Largest fiber is '
Tremoi ite
Pattern of Tremoi-, tei
above
i 1 !i I
`1C -i A
IT