Document b5qXbeOYwq0v8YjEqxnx5YMvk

FILE NAME: Union Carbide (UC) DATE: 1976 July 8 DOC#: UC402 DOCUMENT DESCRIPTION: Memo RE Asbestos Exposure Associated with Automotive Brake Systems .; Mr, A. R. C lar Mr. 3. H. Lloyd Dr. R. J. Sex tors Mr. F. Will lams J u l y 8, 19 '-6 O .'i ( 1'- A sb e sto s hxpqs u rtg_A`s o d a t eci 'A ith Autoro t i v e I r ake. Systems At the request ot the Plant Medical Department, measurements of personnel exposure to asb esto s f ib e r s during brake r e p a ir end in sp e c tio n job task s have see:', made. The s p i r i t of c o o p e r a t i o n on th e p a r t of Hr, h. M. Hoffman w .s commendable './Lille wearing p e rjo n e a l sam plers durin g th re e ty p e s o f ;ob ta s k s u iv o iv la g brake voir.ter.auce. Discussion of escn of tne job ptrfurnances, together vj.th re su lts lr as follows: 11IIS'" : The r i g h t r e a r .-/heel o f a pickup t r u c k was removed fox Insp e c t! o r , I t was determined th a t new brake shots were req u ired and the mechanic proc^eued to vacne.,. the b ra k e drum and r e p l a c e t h e sh o e s . He d id n o t wear a r e s p i r a t o r as a need r a s n o t a p p a re n t. T ine in v o lv e d 21 m inutes a s sam pling tim e . A sb e sto s f i b e r count war 0,1 l i b e r s per mi of a i r w ith the th r e s h o ld l i m i t v a lv e (Tiff) being two f i b e r s greater than fire micrometers in length. Sii80MO: The l e f t re a r wheel wns removed f o r .in sp e c tio n and th e need t o r replacem ent was a p p a re n t. At o u r r e q u e s t , th e mechanic wore a 311 r e s p i r a t o r and used compressed a i r to c l e a n t h e brake, drum, b e f o r e changing th e b ra k e shoes. S i g n i f i c a n t q u a n t i t i e s of fine cast was generated, which dispersed throughout the shop. elapsed time and/or sampling time was 19.5 minutes. Asbestos fiber count of fibers greater that f iv e m icrom eters in le n g th was 0.2 per ml of a i r . There was c o n s id e ra b le d u st c o lle c te d on the sample but less fib e rs, possibly due to a ir dispersion. liilkD: The r ig h t fro n t d isc brake was removed, in sp ected , and replaced cu rin g a sampling time of two m inutes. ho a i r cr vacuum was used. The r e s u lts were 1.9 f i b e r s per ml, which l i k e l y i n d i c a t e s Lite g r e a t e s t ex p o su re p o t e n t i a l a s s o c i a t e d with routine brake serv ice to be the removal arri replacement of tba wheel for in s p e c tio n when a d d i t i o n a l work i s not re q u ire d . This f a c t o r i s time r e l a t e d . he a r c o f cht o p i n i o n t h a t even a t the r.ew two--fj her TLV, t h e r e Is g e n e r a l l y ro problem with excessive exposure rr asbestos m rue automotive, garage. Use of the r e c e n t l y acqui red vacuum c a p a b i l i t y should "out.Inue co be r e q u i r e d . The 3M r e s p ir a to r s should be used, on any sp ecial occasion where d ust le v e ls are suspect o C ccing e x c e s s i v &. Kr. Hoffman shouxd be informed of the r e s u lts of these {eatcrer.ients, arid tf chore a r c q u e s t i o n s , p l e a s e c a l ] me a t blfSi. ' W, / ' '/ / ./ Hf h. F r a z i e r ,f/ ' UCC 008857