Document Y9vm2qoLgKVgyZvXzvBqq23GV

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 AXtJMlflM it CfflMICAl ISm -fiM C B WJFAOTUM received MAR 15 1961 Wt J, D, fosde. AX: Chalmatte CC: J, 0. Pronlay / A. J. tromaarhausen. v X. H. Luton L. J. McAdaa M. 0. Seheuneaaan V. 7. Liauhard, H.D. BATBl Marsh 9, TRCWj A. S, McCliutocV^o' AX: Chalmatte p v SDBJXCX: Dust Hasards from Asbestos in the Machining of Marinite Marinite la a aanuiaetursd mal:erial contalnina a larga percentage of aabautos. 'Bill material la received on the plant alte in large Resets measuring h' x fl' in varying thicknesses from l/2" to 2", sheas Large placet of Marinite ara first ant into pieces of apprwimtsly 8' x and placed in a miring oven. 5fcase ensoller pieces of Korlnite are then out Into a variety of still smaller sisas and subsequently machine-out to a dealred shape, atypical vcodwovSdag mchiaery such os tabla save and band Baas ore used to Cut tfca Wrrinite. Drill praises equipped vlth router bits, bale cutters and special forming tecla ore used to fora the finished product. Bench operations Such os filing and hand sanding are occasionally required. Its finished product asnalata of a variety of different sited and shaped objects for use in the Hatai products Department to control the flew of molten mstai in the casting operations Severe dust conaontratlono are generated when the larger pieaas of Marinite ore cut on the table saw. 'The forming and shaping operations an the Karlsit3 when the drill presses ore employed elao produc larga volumes of dust. I. ASM03PEZ3Ig gAMPLIMB & CUSS COOTOIIiG PBSCSOJRa A. Dust aampies were collected in midget impingara at a sampling rate of 2.55 Litase of air per minute (.&? cubic feet) aver a five minute period. Distilled water containing an seroso), vetting agent was used as the dust collecting medium. B She dust samples vare counted employing standard dust counting techniques. Only those partiles having the eharscterlatlo red shaped appearance Of asbestos were counted. I I . EVALUATION A, Dust samples #1, #2 and #3 vara collected while Marinite vas being cut into blocks approximately 3" square & M 21" long on an 8" table saw, 1. Sample #1. Sample token, la the breathing some of the saw oporSHS3o k&rga vo.luaofl ot fiust CULaojargig roaa til* 3av tilAde wore visible in cloud fora. The duet cloud did not, however, visually engulf the saw operation breathing ions, Dust count os'asbestos vn 24.8 million particles per cubic foot of air. - 1 ~ Medical J&partnent should ho advised by the DapartEitenli Super- .dlon of congastiort of aay exhaust system installed in conjunction tfc the garinita cparationB In order that further dust studies to he loads to determine the eff^otivenaes of the eyataab a, Baggie #3. General air, aaapla taken is the vicinity of north net corner'of the (Jsfprater Shop approximately go1 from the table be Visible dua-t; Iwa iaeuing from the saw 'Iliad & major portion of the room while tMc sample vas being taken Duet count as asbestos van 32.3 million particles per cubic foot of air. 3 Sample #3- Sample taken in the breathing boos Of a d r ill press operator perfosnins operations on Marinette approximately 15' to the rear and vest of the table mw. Visible duet bass fille d , a major portion of room but did not appear to engulf tha area in Which th is sample vas taken, lu st count as asbestos was 6.3 million particles par ratio foot of a ir. Tha foreman responsible for the area, upon questioning, reposted that the visible dust haze which existed in the room a t the time the above samples were taken was typical of conditions which exist during the table saw cutting Of HOrihit. B . . Samples #t and #3 vers collected on the day foilOTiug the f i r s t three samples. The table sae and band sew bad been used for about 10 mloutas to rat Msriniha approximately 1-I/2 hours prior to tha time samples nod #5 were collected. 1 Sample #v. Sample taken in breathing zone o f d r ill press operation fam ing Harinite with cone-shape ratters. % v isib le dust hose in roan. Bust count as asbestos: vas 1.77 million particles par cubic foot of air. 2. Sample f s . Sample taken in.breathing zone o f d r ill press operation cutting Marinita with circular cutter approximately 3" in diameter > Ho v is ib le dust hose in room. Bust count1da asbestos was 3.23 m illion particles par cubic foot o f air. m . comuBiofla Aabestcs is recognised oa a harmful dust. Whan inhaled and deposited in the lunge, this dtast produces the disease Acbnstosis. 5fce max&tatini allowable ebacetttrwttor for (ubeetoe duat as established by 13 American Conference tt .Governmental Industrial EJrgleaistB is 5 mUlira partialas per cubic foot of air. A. Extremely high and hazardous duat concentrations are generated when Marinit* is being cut on the table saw. 2ha dust generated during this Operation is distributed in hazardous concentrations throughout the room (Carpenter Shop), Ibis operation may be'performed several times per week with a gyration of 1/2 to !*hoars depenSlng on send. J B. ie drill prase operations which ware studied vitheut the table anv simultaneously in operation geactatad dust In non-hasantoua quantity. ?s made during the collection of the dust sample# ayv* during random visits to the area indicates -2 -