Document aXe7n0xjzQyeXB0RqbRkr97a
FILE NAME Talc TALC
DATE 1972 June 20
DOC TALC435
DOCUMENT DESCRIPTION Letter to Thermofil Inc. from Desert Minerals Inc.
FINE TALES CLAY PRODUCTS AND OTHER META' JINERALS <4
HIGHWAY COMPANY AMERICAN AMERICAN M18I91NERALCOAST SOUTH
BEACH LAGUNA
902861 ;
Telephone 714 494-0704 ,
June 20 1972
Mr. Daniel C. Fuccella
Product Development Manager
Thermofil Inc.
884 Railroad Street
Michigan 48197
Ypsilanti
|
Dear Mr.
:
Fe^cella 1972 Dick Lamar has forwarded your letter of June 12
in the
asbestos
regulations involved current I have been closely
to this office Because
I am replying|
Occupational with the regulations of the
Safety and
your involved : If '
concern is
do supply our
customers with
copies
of
the Material Data Sheets | due
HealthAct we
threshold limitvalue of
mppcf
for talc
to
New regulations
exceed
showing - a
become effective
July 7 1972 will
list TLV for asbestos
as
not
to
|
This is
|
micrometers . five fibers longer than five
per cubic centimeter of air Volume 37 No. 110
taken
from Paragraph
1910.93a of the
Act
per Federal Register
Table
3
Air
No.
Paragraph dated June 7 1972. Talc is listed in
1910.93
Contaminants Mineral Dusts
under In Paragraph 1910.93a 1910.93a the minerals listed
asbestos include among others
reinforcing agents
tremolite MMany any of the talesatnhdat otahreerbienstduasdtarpiteesd fdoor iu nsceluadsevarying percent- -
in plastics
paint ceramics
from %
to
as high
as 60
We have strongly objected
ages
of
tremolite
ranging
talcs
containing
tremolite in the restrictions applicable to
to the inclusion of
is now being instigated by the talc
to
.
industry asbestos clarification Considerable research
mineral Tremolictlearificationand alteration obtain
modification :of the new regulations
talc as
residual
from tile
of the
tremolite
is present in
basic rocks to themineraltalc
is
Talc is often
ud after
toward commercial =.
-. aTshbeepsrteosesntTcraumepacoimgmnetrcoicaelnatsrboelsatsobseisstocshirsysproimtariilylewdhiicrheaccctoeudntsfor about95 -
specifications indestructbiDebEilaSneEngRyTAcLhCryfis5ot0ileSeries contain None consumption of the world
of our talcs
hazardous for accounts asbestos |fiber
its
so
A fiberis
The nature
describe
of the
the leadingmineralbooks
asindestructibleto
chemicals
|
- or heat
particleas
or woven .We do notconsider the tremolite
-
as
flexible flexibfliebreonuds bcuatn breatshpeurn an acicular or elongatedcrystal 'Itis not
being
ven,
pe
It cannot be woven orspun Itis not
refer to our
as pseudomorph
pseudomorph All our literature and
tremolite ortalcwhich is a
acicular the acicular portion being is
'
our
portion mineral straight talc None of platy after tramolite The
the
Mr. Daniel C. Fuccella Thermofil Inc. June 20 1972 .
Bo
Page 2
percenotf reflect the
tremolite present ray
analyees or technical
literature analysis
indicate
the
tremolitic portion
as being
in
diffraction and microscopic
have our technical literature If not
of 30 to 40 We assume you do
tphleeasreanlgeet us know and we shall be glad to send it to you
made of all phases of this problem one fact clearly emerges
In the study we have
nor talc is prohibitive the only
and that is that the use of neither asbestos
the
of the user to maintain a
restriction and the only obligation is on
part
the
; dust plant within Threshold Limit Values '
hope explains which we
why we
complicated is a very
problem Mr. Fucella
letter of June 12. We do
This i
a brief and simple answer to your
could not give you have talcs containing
lower percentages data will be sent
of tremolite and
you on request
one containing none However we do feel that
50 to " SamplDesEaS ndEteRchT niA caSleLriCes are best suited your uses
our
or if
If you have any questions pertinent to thiinsvomlavtetderplpelaseeaseadlveitseus kno: w ;
any regulations other than O.S.H.A. are
'
Yours very truly
DESERT MINERALS Inc.
|
EJEllsworth EJEllsworth tjf
cc O'Connor Chemicals
Mr. R. S. Lamar
CRMC '