Document GmR3knKY1N4zE91kLN5kkZNDx

THOMAS B. BOSKET PITTSBURGH March 31, 1964 MR. THOMAS I TVNV*V VERSOS WORKS RE: MAR I SITE Since you have had similar problems in the past you will probably be interested in the attached correspondence. ES Attach. THOMAS B. BOSKET Attachments, nnoo B.R.Speer to G.H.Farrah, Mar.9,1964, Re: Machining Molten Metal Marlnite. G.H.Farrah to B.R.Speer, Mar.17,1964, Re: Machining "Molten Metal" Grade Marinite. ARCH 18229  tall trm Krs. Mb nlatlas *a tida ptBlta, at'km r? -' Utwrtpa ttA, wmrm yaBttlwly, calltd ttaa wpgiHtrr Qnfar fTTinia NIm Carpgratlaa) fit HttBasli. ioBrtlas ta tha aq^llar, ear arlgteal infwBUM a Barlalts, tm takas fran a tnte tamot MtalGgn, is Issamst. BarialU/aaltiw aatal ARCH 18230 Mr. B. R. Speer March 17, 1904 2. Long-sleeved shirts or Jackets should be worn to protect the arms. 3. Use of a suitable barrier creaa an the exposed skin should be recoaseoded to those she are most susceptible to lrrltatloa. " Ply Mo. 9 Cel1*, a product of Milbora Cospaa?, Is claleed to pat a file oo the akin which is impervious to epoxies, aalnes, Class fibers, and sost organic solvents. To be effective, a protective creaa aMould be washed off aad reapplied to the cleaa skin several tlaes a day. 4. Tour present practice of cleaning up all Marinite dost by use of vacuum type equipment should be continued. X do not feel that the taking of dust samples will contribute much to solutiom of the problem at this time, since se have no criterion ob which to base an interpretation of the results. The testa we have nade on Marinite dost shoved only slid alkalinity (pB 10.1) as received, and but alight change (pS 10.7) following ignition at about 1300*F. If the suggested precautions do not improve the situation during your next episode of sachlning Marinite, please let me know extensive investigation will be attempted. a more GH7 :E3 cc: Library, ABL Or.D.A.Fusla and Mrs.Virginia C.Koha, ARL Messrs. X.S.Bevarth, S.C.Buddiesten, ABL Dr.L.T.Cralley, Pittsburgh GEORGS H. FAARAH ARCH 18231 INTERNAL CORRESPONDENCE - Engineering Department Alcoa Research Laboratories N evi ':. e r; s i r: ct o n To DR. 0. fl. PARRAH Industrial Hygiene Division Alcoa Research Laboratories Hew Kensington T: - RE: MACHINING MOLTEN METAL MARIKITE Several of the men In the Shop have expressed to the foreman that during the machining of the captioned Marinite they experience' some discomfort on account of clogging of the -sinus and .difficulty ' * ' - ..." j ~j in breathing. Also one of them indicated that the Marinite dust irritated the skin on his arras and face, During the wee/, of March 2, 1964* % C. Barthplf was mach ining small Marinite headers ;in the7lat,he and-itffHas^brought to my attention that he was again having kfnm^V. , .... the dust. I talked to Bartholf alii. atf . . **: dry and red and he indicated that tbe condition had.startedJalasoat0'.. as soon as he started to work on tHeMarinltfcv ` 18232 Drvl`d;-H. Farrah oro'lers and should ?e checked. will you, therefore, please arrange to Hava, your . :. make this check for us? We will arrange to give you advance^ : : \ 'i notice when we will be machining Marinite -on the latlxe^ aa ? v . v. ; -- ^ .P l consider this the most objectionable operation. ^w:o$r. : If there is additional infornation needed ori`l'f we' bah *- * *- *V *. .*p *, ' * . ?,,* . help in any wayr please let us know*/' . ;vv ,:*> . .1 BRSrmJb - ' "' -- v . Library Lt ~ ' * -- *s.#**_v- *r>v*-W.V- r*. - 1 . -^, *v * -r.-'. ;.v a. _' *-/? .s t ' sh-U;-' /^J/ a/ ' ?'r dx>Dy <L ^5*6 ^ / d /^/` 1/9/6*. Q.c^J fa Z/-?y* ^ c~^>r^>/a^, e. <L . ^>. ^ ^ o ^ 9^f /Vwi ^ j ___ t>^_ . <-^yo '(` o*<{ ' s-yC/*&-rt*-**. ^ seyr^. .....<?> .<..! _ ... y . 7 O^y^. t--//f --hrA.^lA^l--------------------------------------------------------------------------------------------- |jv (^) *v# . _ . i^v, dt-cltuf^ w. . _________ t.C ___ __ ______________ ^3______*?',,**'. i.->`~ f-*: C-r*~.______________________ C_, <-- --j/w. 0^^ Cfu-^j-s. ~f~ _f__c~_. wr4^-- j __ r"4 c^../ . *r <J> US*. j _ qLy~* *- *'* d,_. * s _____ ARCH 18234 V 'C HE. INDUSTRIAL, HYGIENE NEWSLETTER SAWING MA R IN IT E J2L J> j>J, tfyj & l/? In recent months several incidents have occurred that prompted us to take a closer look at the potential problems associated with the sawing of Marinite. In the past, because o! erroneous information given ua about the composition of this material, we may have advised you poorly about the proper handling of it. EXHIBIT Jtu4 n In order to correct this, especially in view of the widespread use of Marinite, *#uooAfj-flvDN3d we felt that this Newsletter would be timely,arid appropriate. ' Marinite is an insulating refractory board manufactured-Sy;Johhir-'Mansville. It consists of a mixture of asbestos fibers and diatomacebus earth bonded with an epoxy resin. In Alcoa it is widely used for-headers in DC Casting Units and for trough linings. In order to be used for these applications, .it is necessary that the Marinite first be sawed into appropriate sizes and shapes. -Sawing generates a considejrab^&BOiint of dust'v&ich;j.s;tbe main, if not the sole. cause of difficulty in-bandUng titf*irnatetiaL&: Were it not for the.presence of the epoxy V?G- --V . i'1;vv-- 4 binde r, propexMtioVi'bllWduld consist sijnply of keeping the sawyera., tiime-weighted exposures below"5'inppcf,^the.'threshold: limit value for asbestos. However, the .if--. epoxy binder complicatdsIthc picturi^Cjj-S; ^^^;!?;^^ ; inert - - : ----:Vie'.- amount of unreacted resm and:/haraener. :A*S^e^citr-duit<t?TrDm rnachihing^nd sawing epoxy resin systems are likely to Be'quite ir.ritatiijgV^D^rmatitli^^rri ARCH ^'s227 irv.ius'.rij.l Hvgurne Ci'mn'itlee o*r C.iai rn on May . 1'Mj4 Shift No. '.ru-.H.' bus's i- quite . -niir.on. They may also cause asthmatic - like reactions - r t. 11 -. s n 3 i: : i v uiu.i i s (Wi* have already experienced this in our C orr.pat Beciuse active components of epoxy resin systems are present in them, justs from Marinite* cannot be treated as mineral dusts. Additional precautions are :ie jjs.ir,. 'ii the saw shuulo be equipped with exhaust ventilation. (This . n m accord with '.he ret ommendations of Johns - Mans ville. ) Probably most of tne fan ni:.it n plants will require this type of set up. Respiratory protection is no substitute for exhaust ventilation, except at locations where cutting Marinite is an unusual, infrequent, and brief occurrence. Sawyers snould wear long sleeved shirts to protect their arms from the irritant Oust. Personal cleanliness is also important and the men should be m.itrjc'.ej to wasn up following their exposure to Marinite oust. If any of the recipients have any specific questions or comments con cerning Marinite, we will be pleased to hear from them. The latest of the Hygienic Guides are enclosed: Acrolein, Aluminum, Ethylene Glycol Monoethyl Ether, Manganese, Petroleum Naphtha, Pyridine, Tetraethyl Lead, Allyl Alcohol, Allyl Chloride, Cyclohexane, Ethyl Chloride, ana Triorthocresylphosphate. Thomas B. Bonney TBB/mje Enclosure s cc/encl: Company physicians G- H. Farrah, J. M. Plunkett, ARL F. H. Illig. Pgh. ~M. O. Colwell, L. V. Cralley, file ARCH 18228