Document jBvrQqJG3vMDxBEGVe4mLZprN

Intra Company TO( Hr. l, h. sij^Hn od JS. Cratch i, D. Maraud* , ~~ ' V. Pafcrooolll W. ft. ?inon Scientific Hosaarda nt-mfr -i'- \ Fe*b- rua*ry 27, 1370 S^ijact. La Irak* Lining Haar Dabrli It is estimated that an average of about 10Og of crysotile asbestos par car par yur are eonseaed aa a result of brake lining vai, nil a estimate la based on Lining volume mm from various types of brakes using proving ground Lining Ufa experience, and uaunes typical lining asbestos content and 10,000 miles of us* per year. The average la weighted according to tha 1968 Ford Motor Conpany passenger car product nix. tA previous estimate of 307g vas baaed on unrealistically high wear volmaea and rates.) For a U.a. population of 30 million cars, about 10,000 tons par year of brake lining asbestos would thus be wom away, with, more of the wear being concentrated in regions of high car population density. Approximately 1 ailllon tens of asbestos per year are ccnatmd in the 0-S. far all applications^-*. According to li.bof2, the health hiresrd from asbestos which could be esdttsd to the atmosphere through brake lining wear is snail coopered to the hatari, from asbestos dijpeisad in the air from other sources, such as insulation used in the building trades. Professor Salikoff is an acoocplished worker in the field of asbestos disease epidemiology^ g Electron microscope studies by lynch indicate that less than It of the brake lining wear debris generated during aortal braking ia fibrous asbestos -- the remainder of the asbestos initially present {shout 50A of the lining) is decomposed into non-fibrous dust particles. Ga.trull and Schreiner found asbestos deectapos i tion products la wear debris by Infrared analysis, although their work did not preclude the survival of seme fibers. I -ray diffraction analyses of Jr n dtst in our on laboratory have not indicated the presence of undeccc^osed asbestos. If, based on the work by lynch, it is assumed that as much as 1% of the inorganic portion of the mar products ends up as undaoerpesed asbestos fibers , then, about 1.4g of fiber per car per year would bo emitted {133 ton/year in the C.5.). See attached Refureuaa list. 000003 B`i am PRODUCED BY FORD Kr. B. H. Siapacn -2- fabruury 27, 1970 3-.fi *>Tls fcsbaatoa hu b*n iaplicrtad * a caxdnogon . IT|L|fWtt!*ctd that this esret^K-jt-ic affect zr i"5~>c.'3ted with thu fibrous utnn.ubutw. I V a? no civi^as cr. the tsl affacbs of a&b*sto da'oo^iow 1 tlon . prpOaatm. Gimtiri it nh th*t eh* noa-fl.broua dacratyosltlaB products would s* iWriiapa less permanently implanted in th lmg tii*n if inhaled, od leu liJcaly to b t persistant source of loculi rad Irritation. __ RLG.ed Boy L. Gealsr / Chemical Engineering Depurtaairt 000004 PRODUCED BY FORD * A etfseewces 1. ' -. -- * p_* -3U Brodeur, P., The -lagio --tiaeral," The Saw Terser, octobejrJLl, 1963. S + 1` . . - Selihoff, Prof. Irvin? J., H.D., Mount Sinai School of HoditrLa* of City University of Hew Tort, Private ooBunlcatioa, J*n. 19, 1970. - 3. Selihofff, Irving J., et al., "Mortality Experiences of Asbestos Insulation Mortars, 1943-1963," International Conference an PnetBBococici, Republic of Soith Africa, Sept, of Mines, Johannesburg, April 23 - May 2, 1969, pp, 97-103. 4. Seliknff, Irvin? J., "Asbestos," Environment, Vol. 11, FUxch 1969, pp. 3-7. IT 5. Eellkoff, Irvin? J., et al, Coumjn1ty Effects of Konoccapatlooal EnyiroRnental Arbestcrt Exposure," Aserlaaa Journal of Public Eanlth, Vol, 38, Eaptasbur 1963, pp. 1658-1666. 6. SelJLkoff, Irvin? J., et al, "Asbestos Exposure, Soaking, and Neoplasia," Journal of toe American Radical Association, Vol. 204, April 3, 1933, pp, 106-112. 7. Sellkaff, Irvin? J., "Asbestos and heoplaaia," The Aoarican Journal of Medicine, Vol. 42, April 1967, pp. 4S7-496. 8. Belikoff, Irvin? J.r "Asbestos Exposure and Hooplasia," Journal of the Ansrican Medical Association, Vol, 138, April 6, 1964, pp. 22-26. 9. Lynch, Jeraolah R., "Brake lining Decosiwsition Products," Journal of tha Air Pollution Control Association, Vol. 13, DecssJ-er 1963, pro. 824-326, _' 10. Gstrull, R. L., and Schreiher, T. P., "Chemical Changes at Brake Wear Surfaces,* Society of Autoootiva Engineers, Mid-Tear 1-tea tin?, Chicago, Illinois, Hay 15-19, 1967, Paper Mo. 670511, 000005 PRODUCED BY FORD