Document dYoMjVVQaaXezDRg7E2VdBnae

Barry Castleman's DuPont File CD-ROM Document # DP^? DATE / ? Type of Document - published report from journal - published report from conference - published abstract from conference - unpublished report - unpublished presentation - meeting agenda minutes report - letter ^/- memo - government report - industry warning information - book excerpt - legal deposition of_______________________ - notes of BC on I IVI XW( Ml M Saw *. I k | cc: B. X. Epstein - pimxic* Bxpsxlsen'Ul Station 323/210 Jw* l, 1972 J. B. AKGZAaB piastks bepassboti EXKRIK2HIAL 82*11 323/321 ASBESTOS IHCOKPORATSP X7TTO PI/STIC MAgBRIAX, B. X. Epstein tad J. ?. ArclUge, Plasties Dspartasot, Sa^erlnc&tal Station net with J. A. Zap?, C. 7. asiahsrdt, ?. B. Griffith, C. V. Eddy, tad B. J. Habtak cc June 12, 1972 to discuss yot^i*l_hazt2^ axijlag'; cut of the proposed vust of incorporating-asbestos ...into polysstars tad .wise*.-- . ' Presently Bu Test aarket* a glass-reiaforeed nylon vhile atttr crwrwrnriattte'yw-figi. . .. .asbestos. The Intended use of asbestos in polyesters would be t ncr* endeavor. The flow through the aenufacturiag procedure vould be as follews: Polywar pellets, silane (coupling agent) and asbestop vould be nixed In ta enclosed unit or a bond. This nixture would then be added to the hopper of ea extruder. The aaterial vould be heated, extruded, chopped into pellets, and begged. This vould . be the extent of ln-plast handling. ' ; -,. The curtaeer vould due the produot into the heyper of a welding . ear extrusion machine. At the cod of the process vould be a finished * ^. pert, Tint shed to the extent that the only additional verb en It would be to ttits the excess lsadin plsstis eaterial to the molded pert. ' Cne main object'. of this type of molding is to eliminate excessive . .V. on tbs*peart. There should be no grinding or sending of the part* I J02014 i 0(.'P 004768 | *116978 1 J. 8. Axaitifi 2 June 16, 1972 fbe potential bardi art: 1) Aiding of tba ubutoe in with the polyaer pallets sad silane. . But would bo generated. This operation could bo . carried out Is a hood during --1V trial teats* Tor . larger batches, a nixing unit with good local exhaust should bo designed to ecotyol tbs dust, The operator should soar 17.8. Bureau of Mines approved respiratory protection as he troaefors the asbaetos trea the 6rm cr bag to the aizar. She U.S.8.X. approval sober 21-B - will probably cufflea for this type-of asbestos e^osure. Kill Constance Sdrty suggested barring the supplier * (Uhicc Carbide) send the arterial pra weighed is polymer bags. 3b this way tba bags could bo added ia-toto to the ala to beccae a part of it. Shis oould elialast* part of this one dusty step. 2) Adding the polyaar<*sbestoa alxture to the hopper of the extruder. This operation la eneloaed and exhausted. There asy be sane dusting on the initial adding of the alxture to the hopper. If the present exhaust deeiga does not control this dust release, reeplratory protection of the 'type mentioned shove should bo required. . 3) Pelletizing of the polyaar containing asbestos. Bust nay bo generated at this atop. Presently there is no exhaust at this point but It will be addad if necessary. It was aestlonad that air saaples aay bo taken at this location to detamnia* the degree of dustiness. There aay . be scan loose fibers but tba particles call acted will aero liktly be of the polyaar and asbeatos integrally crabtoed. . If these particles ao released are of a else that can be Inhaled and deposited in the log, the asbestos fibers at the surface of the particle aay exart their .'disease-pfodUoipg aachaalsa. 'Sf aarirrlit tba avast of dust at this stage' of develcpaaot, along with locating tba scarce of dost ' relsasa, tba beat neats of dost control can be aoetnpllahsd prior to full project drrelopnest* - . b) Chopping of wests plastic aaisrial. ^, * ' M Sits is probably asre of a noise prbblaa than, a darting * problem Motion ess aada that full enclosures are reccBsaaalad for tbs control of ths noise generated. Cbservatlons should be aede of these units to detcrola* if there is dust generated, and if so, to whet degree. The dust, if generated, should be startler to that food at tba pelletising operation. Tbs procedure for cleaning tba chopper aay require feather consideration. Bust my be deposited within the noise enclosure and require OUP 00*759 J02C15 116979 J. 2. AraitAfs -3 Jas 16, 1972 brushing ud yacuuaIuc of tbs deposits At periodic lstervAls* Bsspirstory protodim at this ties vqr be Bteutsrr. XT enough dust oaa geaerAtad to wnst local exheast rtstilstim, proper so1m iasulAtim would aIjo bo repaired cb the ijrita. S) Selesse of fibers fro* fisithed port. She Isteadsd use of these products# ss iadlestsd la this setting, should aot post besert to tbs end-users. Sfct fibers sro ASMBtiAlly bcuad Isto tbs preduct sad tbs products srt ad of tbs typo# libs trshe-llnlscs or iaeulatim, where other fsetors contribute to the rtlttst of fibers f*ca the product* Zf st sms future dsts# s product vm emtesplsted where it ess possible for the fibers to be relssssd lsto the stBospbere, a review of the sltuAtim would be wsrmtod. ' Zf further questions srlss cor sssistsaos Is needed on tbs ecotrel of the dust At tbs Tmrloua eperetions* do set bssitAts to civil. osioinai signs tt IlCHAlO J. MUtUUC RICEASD J. HJBItt . ' 3SU3TSZAL SOZEnSX W^/neb OUP 004770 J 02016 116980