Document 65xYppR1VeYoQo126OYNQno6

FILE NAME: Union Carbide (UC) DATE: 1976 July 8 DOC#: UC345 DOCUMENT DESCRIPTION: Memo RE Asbestos Exposure Associated with Automotive Brake Systems ^ * -y fXrs^a.jhip-fJ sV-^NA CU'-VSP.* HCi w-.if A>D ?.A$: Mr - A. 1- Clark .? Xv IMr- ?.. J. Sexton r * "F. williams ?.;h::i: ruth -. c 'o:;. 2?,r. trA>;sSfit ist aga fisc Dfi'd Julv S, 1976 O.-'ji;.-:' f-*hCl'. Asbest:os abcpcsure Associated kith Amt emotive Brake Systems Ao the racaast of ole tv ant Helical leparinsnc.. a-.aasaremeo.os or persoraau 2 X 0 0 \ r a tc asbestos fibers curing brake repair and iaapeocioa bob tasks have bestc trade. 2 h a sirjc of cooperation on the parr Hr.. H, Hcrimat tens commendable ./h a le *;sa. ;ag oersvnns.-. samplers curing three types of job tasks Involving orn.ee eiaialear ace ' bi scus&icr. o: each or tue job perr*ornsuces, together with tcv.uts `s as folj-ovs: I7..R57: the right rear wheel of o c c k u p t r a c k -vas remov, ea f o r i n s p e n t s c r . . a v a s dtrralned th a t neu Drake l e a s w ere re q u ire d and th e m echanic orocueued at yaouuc ehe b r a k e drum and r e p l a c e th e s l i c e s , h e d i e n o t wear a r e s p i r a t o r a s a n a s c tea r .o t a n n a rent. Tim e I n v o l v e d 24 m i n u t e s a s s a m p l i n g t i m e . A s b e s t e s itch e r c o u n t v a s 0 .4 f i o e r s p e r r l o f a i r w ith th e th r e s h o ld l i m i t v a _ v s C-nV) b ein g two ! x b e r s g r e a t e r t h a n five micrometers an length. SECOND: 'tpe left rear vhsel was removed fox inspection, ana the nsc-c iO/ _...ptace.../.-- -..as avparaDt. At our request.- the mechanic wore a Hi resp-taror and used ecnvpres=ec. ait to" clean the brace run before changing the brake shoes. Significant, quantitces o' fine dust was generated, which; dispersed throughout the shop. Elapsed time and/or s&roliag time was 19.5 minutes. Asbestos fiber count of fibers greater Char five micrometers in length was 0.2 per ml cf air. There vas considerable rust coils on die sample but less fibers, possibly due to air dispersion, idlivO: The right front disc brake was removed, respected, and rep/.acea currng a sanipling time of two minutes; No air or vacuum was used. The results vers 1.9 fibers per tai, which likely indicates the greatest exposure potential associated until routine brake service to be the removal end replacement r the wheel for into action, whs:; additional work is not requxrea. :>is factor is time '-elated. In are of the opinion that ever at the ~av tvo-rxecr tub, there -S generaixy - 3 orebiam with excessive exposure to asbestos in too t.u^omottve garage. -ic^ / the recently acquired vacuum capability settle conttaue to t>e recur ten. ..ha of', respirators should. be used or. any spacria... occasion wearc test ,,avesS are .aspcci cf being excessive. Kr. Hoffman should r.a infernar of trs A a - u s o : there are questions, please cal! ne. cica. i;ese m easurem ents, ana MliTVk s // ; - s j uv ,hA-y-----Z--y---~'-'--'--a--.-A---/-i--rlA'AchA H- h. ;rtziet -/ / UCC 008857