Document jmDNbJBVeywrmgmaGL8dpE2

FILE NAME: Neighborhood Exposures (NE) DATE: 1959 DOC#: NE025 DOCUMENT DESCRIPTION: Book Excerpt - Asbestos-lts Industrial Applications ASBESTOS US INDUSTRIAL APPLICATIONS D. V. R O S A T O ENnewgitnoene,riMng\a\sCsaocnhsuulsteatntst REiNHOLD PUBLISHING CORPORATION NEW YORK CHAPMAN 8. HALL, LTD., LONDON Copyright 1959 by REINHOLD PUBLISHING CORPORATION All rights T reserved ^ Library of Congress Catalog Card Number: 59-12535 Printed in the United States of America PREFACE beTsthoiss. bIotsokpudripscousseseiss thtoe mpraonvyidevarbiaecdkgarpopulnicdatiaosnswoelfl aass ufaticltiuzeadl iinnfoarmwiadteionranogne tohfepruosdeusctosf, tahsobuegsthosi.tsAisdbeensttiotsy iiss often obscured. The discussion in this book is primarily con ceArnsebdeswtoitshctahne bmeocrelasfsaimfieildiabrostphecaisalaiznedolpdropdruocdtusc. t and as aeranteewd poance.e Hatiswtohriychhtaeschjnuosltoifgieydisitasdvusaenfcuilnngesisn. tThhiseaatocmceilc manadtersipaalcseanagdethheasnecerdeatfeodr dmeavneylopninewg ndeewmaanndds iomnprboavseidc proTdhuecttsecahtnaolmogoircealraapdivdarnactees. in the use of asbestos have produced some large and important industries. This does not maneyanmtohraet tahsabnestiot scwanillbseupexpplaenctte^dthtehraetsotatbhleirshperdodmuacttesriwalisll, eislimfairnafrtoemasbexeshtaouss.teTdh.eBpeocsasuibseiliotyf osufcnhewtecuhsnesicafolraadsvbaensctoess vaneldopsecdi.enVtifailcuarbesleearncehw, ' dpivroeprseirftiieeds porfodauscbtessthoasvehabveeenbedeen dtieotnesr.mTinheedse,,wahsicwheilnl tausrnimapcrcoovuendt fporrodituscmtsa, nayreneinwclaupdpeldicain thiTshveoliunmcree.ase in asbestos products in the past 2,000 years hbeaesnbreeeanchaedmailsesatorneesuilnt owfotrhlde agcrohwietvhe.mTehnetsamtoamdeicinagweohrkas ijnugncwtiiothn swuicthh mneawtercihaelsmiacsalassbceosntotisn.ueAssbtoestmosakueseidmipnorctoannt iii 106S56 20 Asbestos ydeepare.ndTinhge umpooinstuwreeatihserrecmoonvdeitdionbsy amndeanthse osfeamsoenchoafnitchael driers. The dry fiber can then easily be removed by air suc tion. The process of separating asbestos from rock during the milling operation takes into account the specific gravity difference of the two materials. After the drying operation, the rocks which range in size from 2 to 3 in. are fed into a third crushing unit which is eoirtehearnodf ftihbeergyarraetofreyd tytopeheoarvoyf tshheakceorneotrypbeu.mTpheer csrcurseheends waihriscuhctairoen ohpoeordasterdemboyvemfeiabnesr. oTfheecrcoecnktrpicasdsreisveosv.ePr othweerefnudl tohfethsecrescerne,enasf.teTrirwehuicnhdeirtsizise fmedatetoriaal ftihbeenrizpearssfeosr thfurortuhgehr treAatdmdeitniot.narshaking screens are used to separate fibers into long, medium and short categories. Duplex shaking screens are used. The long fibers remain on the top of the screen, the medium fibers in the lower screen and the short fiber passes through both screens. The rock which was passed over the end of the heavy shaking screens continues to other crushers. The cycle is repeated whereby the crushed rock passes over shaking screens and in turn fiber is removed by airA-sfutecrtiothne. last crushing cycle, the remaining rock is sep abryatmedeabnys mofeaimnspoacftfiobrerdizireersc.t Tbhloewfiobferhizigehrssbpreeeadk hthame mroecrkss. The crushed stone is again fed through the shaking screen in order to remove additional fiber. See Figure 1.7. The milling operations are continuous. After the crushing and suction operations, the asbestos is cleaned, graded and put into bags for shipment. Introduction (Courtesy The Ruberoid Co.) Figure 1.7. Shaking tables are the key to asbestos fiber separation. Finally crushed ore is passed over a vibrating screen which forces fibers to rise above the heavier bits of rock. At the end of the table the vacuum pick-up captures the loose asbestos, draws it through grading screens and into storage bins for packing. Health and Safety Factors naWtiointhotfhtehedeavierlobpymsemnatllofasthbeesatossbefsibtoesr ipnadrutisctlreys, pcroondtuacmeid whehaelnththperofbilresmt ms.iHniynggieonpiecramtieoanssurweserweedreevneolotpwedel.l Iandavsamnuccehd aassbtehsetods,rysmparollcefsibseinrgpmaretitchloeds aisreuspeidckiendmuipnibnyg aainrdcumrirlelinntgs and distributed throughout the manufacturing plants and in 106S56 22 Asbestos vtheelonpeeidghcboourlhdoboedcso. mTehehaarsmbefsutlostopathrteicpleeospoler dwuhsot wwhericehcodne stantly exposed to it. noAt sobcecsutrosaiss oifsteansapsecsiilailcotsyips.eAopfpsriolixciomsiast;elhyo1w0evyeera,rsitisdorees eqxupiroesdedfotor athpeedrsuosnt. tHoodweveveleorp, sainsbceesptorsoitseciftivhee misecaosunrsetasnatlrye provided by the manufacturing plants, it is extremely rare that a person develops asbestosis. Chemical analysis can be made of- dust in order to deter ims inaveaciloanbcleenotrnattihoen mofaxaismbeusmtoscodnucsetnptraarttiiocnlest.haInt focarmn aetxioisnt without creating a health problem. Such varied safety measures are available as well ventilated areas, special masks, and w ater^rinkler systems. Proper filtration devices for collecting dustparticles are available. Products and Markets Basic and applied research and development programs have been carried out for many years on asbestos materials and their products. The consumption and sales of asbestos astseawdiellyl ianscrethaesindgi.v,Nereswitymoinfe itdsepaopsiptlsichaativoensbeheanvelocbaeteedn and improved mining processes have been discovered. These in turn have stimulated new product development. The future growth of the industry may be estimated from an analysis of the items in Table 1.7. Asbestos products are important contributors to the comfort and safety of man kind; they are also important base materials for our ihnigghthlye shcoimenet,ifoicpearnadtinsgpaacuetoamgoe.biMlesa,tereridaulscinegxisotr feolirmiinnsautliantg fire hazards in industry and at home, protecting buildings, Introduction 23 T ahu: 1.7. Asbestos Applications* Raw Asbestos WYaircnk packing TRhorpeeadpacking RFeolltl board PMaipllebroa(prdlain and corrugated) 8In5%sulatMinaggwnierseia pipe covering, HCoigmhptreemsspeedrashtuereet pinascukliantgion Cobmlopcokusnadnfdorloecnocmasointigveoflamggoitnogr Mo(mldoelddecdomoprovsaitrioionufsortyepleesc)trical Mwolidneddingbsrake lining and brake Auatnodmootbhieler pbuordpioessesand railway Rebilnofcokrscement in plastics Filslleerepinerpsla(mstioclsded composition)' FAlsoboersitnogs cement products PPolatstteerryaannddsstcuuclcpoture FPialilnintgs, vfoarrnaisshbeesstaonsdmfilalettrrsess in ISnpsrualyaetdionasbeosftosb(aatcteoruisetsical()loose Inssuullaattiioonn ' of walls and floors Infifboeur)ndations (to resist shock) Ins(ulolaostieonfibeinr) underground con Packing for explosives or other Wdaudidtsin(gloionspeafritbreird)ges and timing Filmteartefribiaelrss and filter pads Pladteivniiczeesd asbestos fiber for filter Coating for welding rods Iningcheese making (spores are Sewer pipe Aspplhaaceltdfloonoratsibleestos) Automobile body undercoating Adhesive Asbestos Yarn BCrloatkhe lining TCaluptec,helfeacctirnigcsal and other Paoctkhienrg, valve stem, braided and Gas mask filters WGaicskkeftosraonidl bguasrkneintgclaoptpharatus TRuobpieng ETwleicntreicorfisxetwuriengwtirherecaodvering SEtloecctkriincgcfaobrlelecaodvecraibnlge TEdypgeinsgfograshamirafnetllteisng SSpteaarmk phlousges Fire-retardant hose