Document dYK6mn1e75RQ4vaVLLXReL2v6

FILE NAME: Talc (TALC) DATE: 1948 DOC#: TALC116 DOCUMENT DESCRIPTION: Abstract from Medical Journal Article The Dust Hazard in Tremolite Talc Making BRITISH JOURNAL OF INDUSTRIAL MEDICINE VOLUME FIVE 1948 EDITOR DONALD Hi INTER I I 1I LONDON BRITISH MEDICAL ASSOCIATION i0 ,ml- ir.ipor- men, of whom 1.090 had .ipparerdj, normal lungs.- O f the 271 men with itemoiistrafile p.umnalities he found non.tis that 23 ',, o f those in stage ! >n nr >os had dyspnea {idles in o f cffoit. O f the second-stage ^ i 41% suffered in CStO&iN this way, u;d iii the .in- si ;,;c sit -..-ii,-.Ai -.- micai OUt o f o w o' 13 had d'.spn sa A.! -at .O'*;, of 5 f.-'vrculou* woikers . Onr had this ivinptom. O; the men with apphrcntty normal rs, and lung*. 4,, htHldysriH.es . 4 \%dtffit nt ..i.nkstjiy to detect : last 3. this symptom or u* assc-. ns tupur*,,jr.-re. net auiiiots spr.xa. therefore eonsMei thtit d'e in t'x in .w c riven to tins, ubercic symptom hy the Trench g o n .o t x tit n m dpng, in round- capacity and comr-cnsats-ar. , igtii-. is very oCndHfu!. lltistr.i- and that test-: o' the aim 's r r d the speed o f te only sible to circulation do not 'icip n e;act.&.Ufig tie pruoleo-, G. C. Pettier inother for 25 The Dust H azard in Tremaiit* "laScMtnfag, `jRSKNBUhO. showed dity in L. f1941). Yak J. BtoL Med.. I f , *4f!. Toe literature o . t -L j l c ; rev.ewco. 'Writers both d crude in Europe and :r. tic-. V S A h a / repot ed Iw cMlIct"*; o! pncumoconios1' . consiste c e* diduse genera1, ed loiilh'i. UTlthS, fibrosis, am ong laic-wotkers S unnw ries o f 5 tat;i> rte dog cases in the U.S.A. are given, necrop-y fim tags betny quoted. A study of \d c mii'ers arm nvUcre in S' niy the Lawrence C ount), N.Y . is deluded The talc mined is sbestos a fibrous variety .allsit asbestine, accompanied by formatoh are itemolite in ;>fibre '' state. The tree silica content o f the dust is stated to be less than T . in mine- "he drilling of the imaged is dry and h ide d u s t control "n-vd Du -t-concentration figures (sampled by midget im pingtri aie given. At the ted red enclose mills the niatciia! ts crushed, soeroert, milled in pebbiemtlis, air-separated, and bagged : some du*t~contcoi hkutut mcasit'es ire used n the last two operations . :sms in An initial rndteaogic-a' survey shov.vd iiiilmonarv lutsous sr, the fibrosis in tJ-5"., of 22! men exarriued, giving a soft haity '' ground-glass ` appearance nr .1 granulat'd''of I 1" bar ml. of sbestos fields, and in some cats- a a nodufntion raJ'uiugicaliv' ot silicotic type. A table shows th a f o f those aged 50 or has the over fibrosis was found in 4 9" .if the controls (carpet- kance, workersi and m 51-5`' 0 of the la !w o rk e rs. Fibrosis valient, tory of sbestos enence ectora- was relatively more prevalent amutig rmilers th a n among miners. Symptoms were those of pneum oconiosis; dyspnoea was gnu Hu iltai; the r.id.ogiaphic change might have suggested, th e ircidettce 'd active tu t or i.uiosiy was slightly irigth*?' than expected. In 6-3% _of the 221 men deposits or plaques of radio-opaque inateri.ii often ut considerable s; v and ippaicnib in the viscera' pleura, were found. I hr sc " t a le plaq u es' have no relation to previous infection, and may not be associated with fibrosis in the adjacent parenehym i ot with ch an g ,1 in the corresponding hilar elands ; m some cases no oihe. lung changes wcie Eicon : the plaques are consider'd to be syir.ptondess. A marked similarity is indicated between tromolitsMulc pneumoconiosis and asbestoses. The uuthoi conchid' that this dust carries a definite ri> k and that i t > contioi 1 necessary. 1.. lie Hale. Changes in the PeSmimary Vessels in Silicosis) (Le .iltera.doui det vasi poinioii.iri nclla sineosi.l N i'v /t,\N ir Cesa.hu. A., and I*k<t m im , i . (1947). M r ! !. U i v o m M , 307. Appraising Exposures to Silica Dust. Hoi m s , E. R.. H emkkn', W. i/tdimr. H.r.v., .C. 29 E., 265. and H on, E. ( . !94?E J. The risk of silicosis depends largely on the -ire o f the y silica particles inhale.I, and it is considered that particleA ot ics- th in s i. a.n.,1 ,.c-r'cHi those of i to Ve. are lT ' H<'v t ;; .v> . t!,i:VVi i;` it i'> Welt SHOW-', v!' ' 'i'f'