Document jyJQmMZGD46Q7dEOGDG5gD932

FILE NAME Manville JMA DATE 1966 Dec 30 DOC JMA068 DOCUMENT DESCRIPTION Memo - Brake Decomposition Products r id nm . Meee | a aot bd . ty Te 15 tie EE I SiS ite : . eee a LO > Se Cee le ste . Lak. . , POL te pth here 2 Wt i aaa)maa . awe se 7 iss es te s game sun oan ran Be . 4 te. ated HE . Aal S , . ae oo > de, see me a t IB . . . mee ary on eee oe AT asses . Se it it . ae Pu seele we ae : yi Woe . eng an 2 ome ae , 4 e : a - "os : EAT od = aaa : VyreA "Ye {rh . pote Raat tg beeat an rea 7 . hoe ~\ pe pew a. mame Cr soy . -, e a ee 2) ay ad a= a are . o ee Ste PUTS mo 1; +f " . BrakBerake Decomposition Products te Brake 8 yaa deehmisaratad Saeed Ma Ss cs Ce Tae Vy bons a his ve H. G. Koch mo oa woes en) -t 4s a ay ae . ., ma ar cawa Public Health roe Tonge ee . aes Service aie toteee rs oy pat Shi, ee a 4 Ledeen, | . rite aReonela ..! TF a BE . den ta das we 4 at+ 2 Daf an Ye i ro tel 1 Research aaS846 eT om mo, 1. . . te ew, Me Midara tty, TR and + .. . nN ge Suea pre Ay te Dee A, e cata beta December30 . SO cde ag * he 1966 : os wate iva . 7 0 & : Sao { | ne ee oe Hee Oe SAR email During giTstngusdi Fs Pes. raat a recent meeting on asbestos and health at I learned that the Public Health the Public Health Service dynamometer 1! yA) osc | tine Service had performed brake , ay! Agee ctv utilising dynamometer performed yet g equipment at the American Brake Shoe Company wear studies 2. the te Company Assistant to the . These data Chief for reported on April 8 1966 in Pate ~womiswripouver Health.by aay Studies Health.by Jeremiah Spidemiology Senior and Field , Department of0) | nbanghWcieeke ae ty. Research and Technical Banitary Engineer Engineering Section "yee la practically no fiber Services in BranchBanitary Briefly the results showed ee the product at test OSee sg micrograph approximately decomposition temperatures 400-5007 neers ~ ... Sumple evaluation ora, micrograph . was by electron -)..,..: be MSE ig) ripped out fyi,_ yee When the test temperature approximated the overload condition condition 700F in apparently deteriorated called called pania stops fiber to be ripped of the brake instead of btehiengrewsoirnnbond permitting offi Approximately results are summarized below sential in thisoffi visible decomposit decomposit . " aly 0: heitety he. ee te ae LF anrthaaoe The . #24 Condition uihigs PeRrwrvenapinwn Type Type RFR Brake vr0 Aer te neseigwiae fr, Type of Brake Test Condition Oa . . Disc brake .e tes a2, aa Rees3sS: een san Han . ey het. * i Tie ote go ie! ane tye A tet AT nate eee ayn fag vee 4 abate a Per Cent Fiber AIRS ; Autobrbarkaeke . normal city driving normal city driving less than % ee WY . 100-200F scott sent less 0 few fibers Se -AAuutoto brake 600-7007driving tfehwana8sine Auto br ke fibers ae 600-7007 driving on igvihr-AutoclutcheNEd SEY Ban hormal 600-7007 1 1 ; hormal 1S 15 rage PEE ey citydriving Ng ee BS VE clutch 450-5507 >> i teatsaria . . Auto brakesree hormalhormal 400-600F Auto brake | = 100-300F mye: iat ag vet os - fibers ) wn ey yagi? sree caa rae few fibers _ ; Bus brake . 450-550F 9 oe > fi . Ba < ' wee nBaemeent eritn ieesnivoee Seaar pattan Eas eae aateyah ae -4 Be aWaciaeean sexaecas Sie 4. cea ae oo 4 < teed os a acuietacd abe, PAs! eM ited te a tyue at Net, yen hattee CAS pe 1M PEA | ees Me Ese oe arpee pte Ba, ss Fat ag Lay er EIEN Ly ge Hyae BS t es: mf otys Fan his) Sea) ie . 3b , at aoe 9h : 4 ar a) . eee tata Mite . RL : ror ee te . . ee ee Te im re ba abet Los ye wae y he hinkel ape wartnt ee Paes nf' a oe * H. G. Koch uaa RedsconeSs heen tay . Seva shen ated AC?poe a -2144246 144246 144246.. ta December 30 1966 - a = - rat oe we hae ee patetatt aes a 4 S nelerra 2 Grinseasbldc| Lig +, Hr Lynch believes that the results clearly indicate that wear of brake wae age Sale - linings is not a significant factor in contributing fiber to the atmosphere 0 2, asya:indicated that ae crane intends publish his data as brief note him to visit the Research Center to review our we would give him permission to aioe very shortly have invited vies: is results with you and have quote our figures - wre a okI believe publicationunder auspices laboratory youSagi that the government oe 2 notifyyou amend would taketh, ate established for oa as ace ate oneen _ of a be far more beneficial than by Hanville I shall soon as a firm date has been this visit 4 a +e a - ih Nate Mee vat qyreding Weat - ge oes copped melee te oy ad . ots ore | ; 5 re i Re 7 ah BOE z . . 7 Me - Sars oN ee Vad oe 1 ae reBee, ks *fi keg 1 5, s > th ae Ment aed . 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