Document V3d23nn3wnq5qwJy9d50Vev6p

U 123 E.STIEG EL STREET, M ANHEIM , PENN. 1 7 5 4 5 . Raybestos^Manhattan July 17, 1975 I. H. WEAVER CORPOHAtt OiRCCTOR CNvinoRMCwrAi control Mr. E. W. DriSlone Executive Director Friction Materiols Standards Institute, Bergen Mall Office Center E. 210, Route #4 Paramus, N. J. 07652 Inc, Dear Ed: Please note the attached article that appeared in the May/June issue of Public Health Reports. The second page of the article contains a reprint of a booklet titled "Brake Repair Work Can Be Hazardous to Your Health." This report, and others which have appeared recently, emphasize the need for responsible action on the part of friction materials manufacturers. Early this year, bulletins were sent to Grey-Rock and Raybestos distributors describing proper brake service procedures. However, I doubt very much that this information has gotten down to the mechanic level. It has been suggested a small card containing abbreviated instructions be placed in every box containing automotive, bus, truck, and industrial brake linings manufactured by Raybestos-Manhattan. Tags probably would- be used for roll lining. The following text is recomnended: IMPORTANT - AVOID EXPOSURE TO ASBESTOS DUST. - DO NOT USE AIR HOSE WHEN PERFORMING BRAKE SERVICE WORK OR FOR CLEANING WORK AREA. - USE VACUUM CLEANING OR WET CLEAN ING METHODS SUCH AS DAMP CLOTH OR OIL TREATED BRUSHES. - DO NOT GRIND OR 0TiRWISE MACHINE BRAKE LINING MATERIAL WITHOUT ADEQUATE DUST EXHAUST AND COLLECTION EQUIPMENT. I strongly recomnend all FMS| member companies adopt similar policy and procedure. Very truly yours. i v 1 I. H. Weaver Corporate Director Environmental Control dm MAR 000410  The Hazards o? Asbestos for Brake Mechanics BARRV CASTLEMAN. LUCILLE A. CAMAROTA. ALBERT J. FRITSCH, SUSAN WAZ20CCHI, and ROBERT G. CRAWLEY ASIJESTOS is the generic name of a group of hydrated magnesium silicate mineral fibers. There are tw.o groups of these mincrajs--serpentine (chrysotile) and amphibole (amositc, crocidolite, anthophyllite, tremolite, and actinolite).. Ninety-five percent of the world's asbestos production is chrysotile. Reports of epidemiologic and pathological studies (7--4) reveal that occupational exposure to commercial asbestos minerals enhances the likelihood of a number of diseases--asbestosis and cancers of the lung, pleura, peritoneum, larynx, and gastrointestinal tract. The time from onset of exposure to the time of clinically ap parent disease is usually more than 20 years. Cancer from asbestos is not limited to workers who handle the material. There are, also reports of' pleural and peritoneal mesothelioma (tumors rarely seen in the general population) in persons with family, or neighborhood, or indirect occupational exposure to asbestos (4~7). Mesothelioma was the cause of death of a man who had regularly sanded vinyl asbestos floor tile (S). Under simulated conditions of this man's work, a maximum asbestos dust concentration of 1.3 fibers per ml (fibers longer than 5 microns) was found in air samples passed through membrane filters worn by a person sanding vinyl asbestos (S). The type of asbestos now used in domestic floor tile is chrysolilc--the same as that used in brake friction materials, according to the Asbestos Information Association. A case of mesothelioma in a brake mechanic has been reported (9). Commercial friction materials used in the United States for braking passenger cars and trucks contain anaverage composition of 50 percent chrysotile by weight (10). Asbestos has been used for brake drum linings. disk pads, and clutch facings foh the past 50 years. Jacko and DuCharme (11) estimated that the United States annually uses 103 million pounds of asbestos for brake friction materials and 4.5 million pounds in automotive clutch friction materials. In 1968 Lynch reported that because of the heat of friction caused by braking, almost all of the asbestos in brake linings is transformed to a nonfibrous mineral, and a small fraction of asbestos escapes as free fiber (12). Jacko and co-workers determined that vehicles in this country emit 158,000 pounds of asbestos per year, of which 11.2 percent is retailed in the brake and dis posed of during service (13). Brake mechanics have low and intermittent exposure to asbestos. This exposure has been reported to be 0.79 fiber per ml time-weighted average (fibers longer than 5 microns), with peaks up to 7 fibers per ml when brake parts are being cleaned (14). The standard method for removing dust from brake parts is to blow it out with a Afr. Cattleman, an environmental engineer, was .with the Center Jot Science in the Public Interest when this paper was prepared; he is now with the Maryland Public Interest Research Group. Dr. Fritsch is director of the Center fur Sciente in the Public Interest. Ms. Carnarota is an occu/>alionai health nurse. District of Columbia Department of Human Resources. Ms. Ma'ZtHthi was a research associate. Environmental Cancer Research Project, Environmental Seirncrs Laboratory, Mount Simu School of Medicine, plew Fork City. Mr. Crawley is a sanitarian, llaltimore County Department of Health. Tcarshcct requests to Barry Cattleman, Maryland Public Interest Research Group, 3110 Mew Main Dining Hall, University of Maryland, College Park; Md. 20742. IS4 Public Health ftoporu MAR 000411 can'llsoil nir hose. In 1970 several reports (l-l- IK) described the levels of exposure of brake mechanics to .asbestos, alternative friction materials, and specific changes in brake repair practices which would reduce the levels of exposure. Baltimore and Washington Studies In December IV72, the llaltimore County Department of Health mailed a 1-page mimeographed circular to about 130 establishments which provide brake repair service. These businesses included new car and truck dealerships, certified motor vehicle inspection stations, and other concerns advertising .brake repair as a specialty. Some of the establishments initially con tacted had cither gone out of business or replied that they do not do brake repairs. The circular warned that inhalation of the dust from brake cleaning could cause serious diseases, including cancer, and advised vacuuming brakes of accumulated dust. Additional measures suggested were improved ventilation and the use of face masks (19). Two student volunteers went to WO of the /daces on the mailing list 4 months later to ask shop managers what methods they were using in brake repair. A similar study was started in Washington, D.C., in August 1973. This work was conducted by the Center for Science in the Public Interest and the District of Columbia Department of Human Resources. Of 186 brake service establishments initially contacted, 120 were followed up. Several new methods were tried in order to improve the effectiveness of the warning. The warning leaflet was more eye-catching and readable than the paragraph-form sheet used in Baltimore; the leaflets were handed out by an occupational health nurse to the mechanics themselves--none were mailed; and followup to ascertain the degree of effectiveness was conducted by the same nurse who interviewed the repair shop managers. The Washington study was also featured in a local television program at the time the leaflets were first handed out. To assure that students trained in brake repair by public vocational schools would Irani proper methods, health officials met with appropriate school officials in both locations. At the time they were contacted, school officials in Baltimore and Washington reported that the schools were teaching the "blow out" method of brake dust removal to the trainees. The standard method of cleaning brakes is "blowing out" with a compressed air hose, in Baltimore, 65 per cent (65 per 100) of the brake repair establishments contacted were using this method at the time they received the warning circulars. In Washington, the figure was 91 percent (110 of 120). Most of the managers and workers interviewed had never heard about the hazardous potential of brake dust. Predict ably, the responses ranged from annoyance to apprecia tion. Of the 65 places in Baltimore initially blowing out brakes, 11 were using either vacuum or wet brushing methods at the time of followup. Four others were still blowing out brakes, but had improved ventilation or provided dust masks, or both, to reduce workers' ex posures. In Washington, only two establishments had changed to wet brushing, but none were vacuuming brakes. Four others provided face masks. Interestingly, two others decided to change brake shoes in all brake repairs, thereby simplifying the problem of dust removal and reducing the mechanics' exposures. The degree of improvement, indexed by the percent-, age of establishments converting from blowing out brakes to safer techniques after a single warning, was 23 percent in Baltimore County and 7 percent in Washington. This disparity probably arises more from differences in the methods of the studies than from differences in the study groups. It may be critically important to approach manage ment at the outset in order to enlist the cooperation needed to implement any changes in practice. A ' mechanic who is approached directly with a warning may simply disregard it. The mechanic might reason that if the dust were really dangerous, there would be a law requiring the use of preferred methods in brake repair. And the employer, if not asked to participate from the beginning, may well conclude that he need not be concerned with the matter. The failure to i.nvuivc management may be the main reason why the Washington study produced less gratifying results than the Baltimore study. Brake warning programs consist ing merely of mailed warning notices require little manpower, compared to other health programs. Also, the effort to implement safe techniques in public vocational schools is time well spent. Conclusion Over a 7-ycar period ending in 1976 ( 20,21,1, the U.S. standard for time-averaged exposure to asbestos will have been reduced from 5 million particles per cubic My-Jono 1975, Vol. 90. No. 3 2SS MAR 000412 loot ul .lir 10 z liner.> |ia im im-u i..a.................. miernns). IW asbestos textile plants, this reduction is about 15-fold [22). Present and scheduled standards 'claim only to protect workers against nsbestosis, the disease for which the dose-response relationship is most quantitatively known. 'Hie British standards for `chrysotilc and amositc asbestos, which arc comparable to the asbestos standard scheduled to take effect in the United States in 1976, do not purport to provide protec tion against increased risk of cancer (23,21). Previously studied cohorts of asbestos workers were exposed to time-averaged concentrations greater than 2 fibers per ml (fibers longer than 5 microns). Current studies of cohorts with time-averaged exposure on the order of 1 fiber per ml (greater than 5 microns in length) may provide evidence of hazard at that level. In view of alarming preliminary findings of pulmonary fibrosis in such a cohort, the National Institute of Oc cupational Safety and Health has suggested to the Department of Labor that consideration be given to further lowering of the-asbestos standard (25). The average brake mechanic is not aware of the potential hazard of airborne brake dust. Nor is he quick to change time-hardened habits when warned of dangers if he cannot feel their effects. Nonetheless, sub stantial reduction in asbestos exposures during brake repair can be achieved by simple changes in technique, with the use of equipment already available in most brake sen-ice establishments. In view of the tendency of the accumulating literature to reveal cancer induction from asbestos at progressive ly lower levels of exposure, mechanics should be ad vised not to blow out brake parts and to use instead methods which create less airborne dust. The manufac turers of automotive friction materials could easily at tach a clear hazard warning to every item sold. The limited success of both the Baltimore and Washington studies shows the limited efficacy of volun tary compliance with health warnings--the shop managers and the mechanics simply do not have the same regard for a warning that they have for a regula tion. The margin of safety, if any, provided by the current asbestos standards has been sharply criticized as insufficient (26). While it is advisable that brake mechanics at least be warned of the potential hazard of their work, it is also apparent that blowing out.brakes will be a common practice so long as health regulations permit it. Refrmircs 1. Cooprr, tv. C., cl al.: Asbestos--the need for and feasibility of air pollution contrail. National Academy of Sciencei, Washington, U.C.. 1971. 2. SclikolT. 1. J., IltinitiHind. K. C., and Olnirg, J.: Mortality ex periences of asliesioi insulation worker!. /* Proceedings of the Inirrnatiuiial Confrrrittc on I'nruntoctmimis, Johatuirdnirg, 1969. rditrd by 11. A. Shapiro. Oxford Uni\crsity I'resi, Capetown. Smith Africa, 197U, pp. 180--186. 3. Strll. I*. M., and McGill, *1*.: Asbestos and laryngeal carcinoma. I. Nrtthouse. M. I-, anti Tlmitipwin. ||.; Mrviihrlumia ul thr pleura anil |K-riionrtiin follow im; cx|>turr iii.isIk-mo, in tlic t.un- dun area. Ilr J Iml Met) 22: 261--269 (1965). a. l.iclicn. J., and J'htawka, II.: Mrwitht-liuiii.i anil adscstnx ex posure. Arch Environ Health 14: 559-- 563 (l%7). ri. Wagner, J. C,, .Slci-gs. C. A., and Marrhaiul, 1'.: Diffusr pleural nirsnthrlioiu.-i anil alctox rx|Hiturc in thr North Western Capr I'rovincc. llr J Iml Med 17: 250-271 (Itut). 7. Unltjtirn, I'., Uahlirn. A. F.. and Kin/. I.: Kpiilrtninlogie drr Hlcurainrsothrlioma. Vnrlaufigrr llrrirhl ttlrer 119 Falleaus drm Hamburger. Kaum I'rax I'tinniml 23: 547--J5H (1969). 5. Murphy, K. L... et al.: Floor tile installation as * source of asbestos exposure. Am Hex- Rctpir l)is 104: 576--580, October 1971. 9. Sullivan, R. J., and Athatiassiadis, Y. C.: Preliminary air pollu tion survey of asbestos. National Air I'ullutiun Control Ad ministration, APTD 69--27. Raleigh, N.C., 1969, p. 32. 10. Harwood, C.: Aslicstos air pollution from the wear of brake linings. Illinois Institute of Technology Research Institute. Chicago, April 1972. 11. Jacku. M.G.. and DuCharme, R.T.: Brake emissions: emission measurements from brake and clutch linings from selected mobile sources. Environmental I'rotrctinn Agency Report (8-04-0020. Ann Arbor. 1973. 12. Lynch, J.: Hiake lining decomposition products. J Air Pullut Control Assoc 18: S24--S26 (196S). 13. Jarko, M. G,, DuCharme, R. T., and joiners, J. H.: Brake and clutch emissions during vehicle operation. Paper presented at Society of Automotive Engineers Meeting,'Detroit, May-1973. U. Hickish, D. E., and Knight, K. 1_: Exposure to ashestos during brake maintenance. Ann Occup Hyg 13: 17-21 (1970). 15. Hatch, D.: Possible alternatives to asbestos as a friction material. Ann Occup Hyg 13: 25-29 (1970). 16. Knight, K. L, and Hickish, D. E.: Investigations into alternative forms of control for dust generated during the cleaning of brake assemblies and drums. Ann Oceup Hyg 13: 37 -39 (1970). 17. Lee, C. L.: Removing dusts from brake assemblies during vehicle servicing--alternative cleaning methods. Ann Occup Hyg 13: 33 - 36 (1970). 13. Bentley, M. L: Control of the useuf asbestos-containing (rietion materials. Ann Occup Hyg 13: 31--32 (1970). 19. U.S. Senate, Committee on Commerce: Toxic Substances Con trol Act of 1973. Hearings before the Environment Subcom mittee. Statement of B. Castleman. 93d Cong. U.S. Government Printing Ollicc. Washington, U.C-, 1973, pp. 117, 349 --350. 20. Guenther, G. C-: Emergency standard for exposure to asbestos dust. Federal Register, vol. 36. No. 234, Dec 7, 1971, pp. 23207-2320$. 21. Guenther. G. C-: Standard (nr exposure to asbestos dust. Federal Register, vol. 37, No. 110. June 7, 1972, pp. 11318--11322. 22. Lynch, J. R,, Ayer, H. E., and Johnson. 1). L.: The in' tcirelatioiiship of srlerird asbestos exposure indices. Am I nd Hyg Assoc J 12: 598--604 (1970). 23. 1 lygicnc standard lor chrysotilc asbestos dust. Ann Occup I lyg . II: 47-49 (1968). 24. 1 Iygiene standards for airlxieue amositc asbesttis dust. Aim Occup Hyg 16: 1-5 (1973). 25. Key. M. M.: Rcujscning <>falsrsius siandaril. Mniiornmltim inJ. Siruder. Assistant Srwvtary of i-ilmr. I t. vupaiiimal Safety and llcalili Adininistratiun. Offit-c uf Technical Puhlicatiims, National Iiwlitutc for Octupatimul Safety and I h-allii. Ruckvillr. Md.. March 28, 1974. 2ti. Cier, II.. and lloulmys. A.: Artioti on ailtesnis. N Engl J Med 28S: 1317-1318. Dec. 2. 1971. 251 Public Health Raports MAR 000413 reventive Health Care ien with long experience as brake lechanics should have a physical exmination at least once a year and referably every six months. This should iclude a chest X-ray. The examining hysician should be informed of the ion's job and his exposure to asbestos. you have, or have had, exposure to sbestos, cigarette smoking is particu-- arly bad. If you smoke, stop. 'ow You May. Contact Us lease let us know what action you aresking, what ideas you may have to ffer, and what problems you encounter i following our suggestions for making pur workplace safer. lontact: Tenter for Science in the Public Interest 779'Church Street, N.W. Vashington, D. C. 20036 !202) 332-6000 BRAKE REPAIR WORK CAN BE District of Columbia Department of Human Resources Community Health and Hospital Administration Occupational and Employee Health Program' Center for Science in the Public Interest MAR 000414 What Are The Hazards? Dos & Don'ts For Your Protection Brake linings contain large amounts of asbestos fiber, a substance harmful to your body... i To protect-yourself and others in your workplace against this hazardous sub stance: The risk of lung-, cancer, for-people who smoke-and work with asbestosis 92-times greater then for people-who neither.smoke norwork with asbestos- Among a number of groups of asbes- tos workers,..one out'of. .every .five deaths.is due to lung cancer..-.--.- :: The risk of .a serious- lung-disease, . called asbestosis, and cancer of other - body sites., is- about-the- same., for . -1 smokers, and`nonsmokers- ajike.who.- f work'with asbestos... . . : . At present, it is not known what level of' exposure to' asbestos, if any, is safe. Even a small amount may be dangerous in some-circumstances. Asbestos-related disease usually takes 20 to 30 years from the time of exposure to become- evident. Work ing with asbestos for even a short time could result in asbestos-related disease later on. DON'T clean brake assemblies andv .. drums, witlr an air hose;.:, (fiber dusts..... generated.by this method-are. danger : ously high..} V. r DON'T brush or, by any other method,, raise dust. ' DO vacuum out all the fiber you can. . DO wet-wash the parts with paintbrush and kerosene; . . . . - . r&y j DO use a protective mask when ex- posure to asbestos dust cannot be avoided. Several companies manufac ture disposable masks, costing from $.50 to $] .50. For information on where these may be purchased locally, call the Center for Science in the Public Interest at (202) 332-6000. MAR 000415