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Examination of Asbestos _!n. TnlcL{fil..4-J.07)_ _ _ ___ __
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Date Coupleted--8LJ.2122 - - - - ]
The Ill.lnols Pollution control Board has adopted regulation, restricting asbescos omis"ion . In order Lo estab lish S-W compli ancts it was nece:, 1ry
to detenninc i:he prooonce or obtsencc or Cibrous asbestos in talcs used inJ
Chicago r~uducLJ.on .
Microscopic :md X-ray di ff-roction examination of the four talc used in Ch:lC:AL~O pl."oduct:ion .Lndicncos c hot G2' 20 26 and 62 30 21, both !lltala, ore cla:in tnlct1 ; t ho fonn~'I'.' J.o of Cina~ and more uniform particle dze. The 62 20 21 (Nytn l ) nnd G2 20' 21, ( HJ.ot:ron) tale are contaunated with trcn1olite_ which iA 11 irf ""l""-1 o1uooi.l.cd aa aabeetoa 1 the former contains more tremolite.
CAM-372
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Analya 7_t._....... "...-'lA--=:;_.__,..:;;v_h_,___~_(l._',_ _
_~__'L'7. - _'Richard W, Scott, Di.rector
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;r-- Analytital Research Department
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Dr, Prank H. Chung/sc .'//
Sherwin-Williama ReseArch CPntir
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01344567899999
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COMPANY CONFIDENTIAL ADP-843S
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Talc and asbestos ara often intermixed in the same ore deposits.
Both are different crystal fo:mis of hydrated masneaium silicate minerals.
There are two classes of ae~estos, chrysotile and amphibola. Moat of the
I materials commarcia~ly known as 'asbestos' are chrysotile; all varieties
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other than chryaotila are called amphibole. The fundamental differences between them are:
Chrysotile
Amphibole
Vary small cross-section
Tabular Soft and flexible
Large cro~a-eection
Flat narrow sheets Hard and brittle
:, Tramol!te is an amphibole praaant in two of the talcs, Nytal and Mistron, used in Chicago production. It la noteworthy that no tremolite was obeerved in the two Emtals by either microscopic or X-ray diffraction methods.
,. I The asbestos regulations are concerned with air-borne aebestos, which
lllight cause lung cancer or s19,n tU11ore, but not the asbestos in the paint aa such, Normal weathering of a paint film should not yield enough asbestos to be of concern. Therefore, our attentions should be directed to Che
.. factory operations of introducins the talc into the reactors
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01344567899999