Document rBZLELOYMKd3xemYEy8GzoVbe

FILE NAME: Kaiser Aluminum (KA) DATE: 1961 Mar 9 DOC#: KA002 DOCUMENT DESCRIPTION: Memo RE Dust Hazards from Asbestos in the Machining of Marinite KAISER A lU M im ! Si CJEMICA1 CHOfOfWCt: U r a E R - C M C B M2WKAUECM R E C E IV E D MAR 1 3 1961 TOi J , D . fa n d s il AS: C h a lm a tte CCi J , 0 f t f o s l a y / A . J . TroasarhauBOB. v 2 . H. Luton 1 J , McAdams H. 0 . Scheunem aaa V , F . L itm h a r d i M.D. BATE) * * , 5 , 7 BCMJ B . S . K c S U n to s k / ^ J '''^ AT: C h a lm a tte H SUBJECT: D ust Ealo r d s from A sb esto s in tha M ftchJaibg o f M a r im ta Marioite ts a manufactured Material costalaing a Laras peroeataga of asbastos. Shis matariol 1 received on the plant alto in.Largo sheets measuring b1*.Ix 8! in varying taiaiasiBsa from l/2" to 2", abase Lara places at Mwiaite are first oat into pianos of aijproxlmtaly Z' x k` ana placed in a aiming oven, kobo smaller piece of JiiwAnita are the cut into a variety of still snailsr nises and subsequently nwobino-out to a desired shape. Typical woodworking machinery such aa tails save and band Bass are used to Out tha Karinite, EriU praaaes quipped with router bits, bole cutters and special forming tools are used to fora the tfiniabed product Beech operations such as filing and hand sanding ara occasionally required. lba finished product consists of a variety of different sited and shaped objects for use In the Hots! Products Department to control the flew of molten ssatai in the casting, operations Severa dust aoEcemtrafctons are generated when the larger pioasa of Marimba arc cut on the table saw. The tormina and shaping operations on tha Maririte vhaa the drill presses ore employed also produce large volumes of duet. I. AiOtOSPEZRIO SAMFLZBS & BUSS COUTOTKG BBOCgDUKa A Dust samples were collected in taiigat iapingers at a sampling rata of 2.55 litas of air per minute (,06? cubic feet) over a five minus* period. Distilled water containing on aerosol vetting agent vos used, as the dust coileating medium B. She dust samples ware counted employing standard dust counting techniques. Only those particles having the characteristic red shaped appearance Of ashes boa ware counted. ' II. ZVALUA'HDH A, Bust samples #1, #2 and #3 ware aollested while Marlnite was being cut into bioala approximately Z" square and ah" long oa an 8" table saw, X. Sample #1 Sample tabon ia the breathing soma of the saw oper ationlarge volumes of dust discharging from the saw blade were visible in. cloud form, The duat cloud did not, however, visually engulf the saw operation brasitting sona, tost count os asbestos Was 24.H million particles per pubic foot of air. laary dusrt scorce t ih drill pw operation io ite seras asa ara large sdacea of Marini4e ara thr*/n or dropped M tee rinite duai ffhioh romaica trapped la cosoavo netrons of the ijiahsi places aro ta-sped ti. -s I.l^ i'h i s, gSBlSS #> General air, aanpla taken. in tha vicinity of north net earner1'oi the Carpenter Shop approximately 0' irosa the table aaw. Visible duau fcsiw Ihsuing iron the saw filled & Major portion of the reem while this sample waa being taken* Bust count as asbestos was 22*2 million particles per cubic foot of air, 31 Sample #3* Sample taken in the breathing isoea of a drill press operator performing oporatioas on Harinite appwjdmataly 15' to the rear and vest of the table saw. Visible dust base filled, a major portion, of scorn but did not appear to engulf the area in which this sample was taken. Gust count as asbestos was 6.5 million particles per cubic foot of air. Tha foreman responsible for the area,, upon questioning, reported that the visible dust hast which existed in the room at the time the above samples were taken waa typical of conditions which exist during the table saw cutting Of KCrihite, B . . Samples #t and #3 vers collected oa the day following the first three samples. table &aa and band saw bad been uaad for about 10 nlnutac to cut jasarialtu opproxlraiely 1-1/2 hours prior to the tin samples and #5 vat* caUaciad. 1. Sample -Ft'. Sample takas in breathing zone of drill press operation forming Marinite with cone-shape cutters. Bo visible dust base in room. Bust count as aabestos was 1*77 million particlea per cubic foot of air. a Bangle f S. Sample taken in.breathing zone of drill preus operation cutting Marinita with circular cutter sppfojdisataly 3" la diameter. Bo visible dust h o w in room. Bust count1an asbestos was 0.2B million particlaa par cubic foot of air* in. coEELUBxoaa Asbestos ia rucognisd as a harmful dust. Whan inhaled and deposited in tfca lungs, this dust produces the disease Asboatoaia B*e xitami allowable eottcetttrwit&oB for wbentos dust aa established by the Americas Conference *f .Oovemaontal Industrial hygienists is 5 million portlalaa per cubic foot of air. A. Extremely high and hazardous dust concentrations arc generated when Marinite ia being cut an 1&9 table. saw. Tha dust generated during this Operation la distributed in hazardous concentrations throughout the roc (Carpenter Shop), Ibis operation may be'performed severs! tioaa per week with a duration of 1/2 to 1 hours dspeoilng on need. J B. The drill press operations which ware studied without the table saw oimultoaecualy in operation generated dust in noe-liacarious quantity. 2sfr/a,^fS "S'58 w i a 3 the collection of the dust anplas and, during random visits to the area indicates " &