Document 1gX6r4qvw079j97xEQBNOqr4E
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Jure 2, 1965 Kef* 609
Mr. H. Janos Sigalcx?.
Cv/ar*s -Coming Fiberglas Corporation
General Offices
'
Toledo 1, Ohio
Dear Mr. Bic$alev;;
Ue ,arc av:are of wcWv--1-'VO--21 on ^ % estss ever 1 .* %voral prc-.cs
progress Which roll i hazards are andi. .w*7 .
vuracs an
The u. 5. Depar fare in 1562 started an "Occupational Health S tudy or the Asbestos Products Industry-" This study covers as bestos textile, brake linings, asbestos ccrcnt and thermal Insulations. 2 v.ould accuse your Mr* Taylor knows about the insulation. part of this study. Enclosed are- tr.o offi cial pub1leatiens of the Department' of Health >. Education and Welfare related to the study and the asbestos textile industry* We would be glad to keep you advised on addi tional information if you vn.cn*
There was a conference or* ,JThe Biological Effect of
Asbestos11 in uCT/ York City on Catcher 19-217 1964. A
copy of tlie program is enclosed along with abstracts of
SelilioffTs papers- You could request copies of all the
articles from the Kew York Academy of Sciences. We have
not received the information as yet.
.
A report titled :,An Epidemiological Study of lung .Cancer In Asbestos (Chrysotiie) Miners" (Thotford Mines Black Lake) by D. C. Braun, M. D. and T. D, Truan, M.A *
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2 Particle
level
Dust ovd treasure
Ivuepiratar s
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Dust Level
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I'oot of the states have adopted the linit reconnonded
by the American Conference of Goverrrzent, Industrial
Hygienist, a quasi official group which has asciued
leadership in establishing safe Units for nany of the
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dust is 5 uillion particles per cubic foot of -`air for
nxcroscopy*.
.
A complete discussion of cast saupl-o collection and evaluation is given in "Industrial Dust" by Drin/.er and Hatch published by HeCrav; Hill, and in'`'Induetrial Hygiene and lexicologyt: r Vol. I, published by Interscience Publishers, He:/ YcrI-:,,
.2 Cut?. And Deferences on Critical Particle Sice
Yhere is cone controversy over the relative dangers of
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Mr- II. 22X12s Birnlov;
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2. Pry:?. And References Cn Cirtical Particle Sine fcont.)
cnall particles (short fibers under 3 microns in length) and long fibers of lO microns or more. Long fibers nay . provolte a fibrous reaction in lung tissue senov/hat core than short fibers- Cut long fibers in the air have a lesser chance or getting do:n deeply in the lung bo . cause of entrappnent in the upper rosipratory system.
So the ri'/**** r* V-i.vrtef* conger cf snail and large particles
tend to balance cut* A comprehensive discussion of * dust particle sice and its sigiiiricar.ee is given in
*?ulainary Deposition and Detention of Inhaled Aero sols'1 by Match and Cross, Academic Press, Men Yorlc, 1364.
Recommendation on Hot/ to Measure Dust Level, Equipment,
and Procedure
.
Although the original Greenberg-Se&th inpi; of dust sampling is rcccgr .iced as standard, it has been
shot's that sampling v/ith i ropcrly calibrated midget ec
pingers, portable electro- static precipitators and nenbrar.e (Millipore) filters vd.ll give comparable results, The important part of the dust measurement is the count ing cell. Counting is an eracting and tedious procedure
4 Mash ar.d Filler Rcc
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Any respirator and filter combination approved by the U* S. Bureau of Mines for protection against pneumo coniosis producing dust -mill provide satisfactory pro tection. The respirator should be fitted carefully to each individual. If one brand does not fit snuggiy another should be tried- The leading manufacturers of respiratory pzotcctico o-ruipaent are Mine Safety Appliance Company, Anori can Optical Company, and Wil son Products. Attached ;is a copy of a guide on As bestos published by the American X: lustrial Hyg Association.
I vd.ll try to obtain the info: ition you requested on the oerccnt of fines that is fifty .cror.s or longer.
Very truly yours.
EAF: adn
E. A. Farrell'