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FILE NAME Brakes BRK DATE 1973 Apr 26 DOC BRK046 DOCUMENT DESCRIPTION Letter to Barry Castleman from Dept of Health with Info from NIOSH Automobile Brake Survey DEPARTMENT OF HEALTH EDUCATION PUBLIC HEALTH SERVICE AND WELFARE HEALTH SERVICES AND MENTAL HEALTH ADMINISTRATION April 26 1973 . Room NATIONAL INSTITUTE FOR OCCUPATIONAL SAFETY AND HEALTH 527 U.S. Post Office & Courthouse Cincinnati Ohio 45202 Mr. Barry 1. Castleman Division of Air Pollution & Industrial Baltimore County Department of Health Maryland Avenue at Hillen Road Towson Maryland 21204 Hygiene Dear Mr. Castleman The information on the NIOSH automobile brake survey that you requested in your letter of April 10 1973 is enclosed Included are the original objectives and procedures envisioned for the project the final results of the survey project accomplishments were far less than had been proposed and six published articles that may be of some interest in brake linings and friction products regard to Please note that the e e msautrivoeny orensluylts have not been published and are for your infor- Rr FTES In regard to your request about asbestos exposure levels in asbestos plants I would refer you to Tables XXVI of the NIOSH criteria document for the most recent data as collected by NIOSH Note that these data are thus do not indicate whether or not entirety is above the present OSHA listed by operation and a given plant in its standards Page 2 The and NIOSH asbestos data was collected for research purposes the fact that levels were found in excess of the OSHA only standards does not indicate that compliance actions were sub- sequently initiated by NIOSH Any information concerning excessive values were referred to OSHA who then had the option of conducting their own inspections for determinating if violations existed I would suggest that to obtain data you should contact the indicated below information concerning actual compliance OSHA area office in Baltimore as Maurice R. Daly U.S. Department of Labor Occupational Safety and Health Administration Federal Building 1110A 31 Hopkins Plaza Charles Center Baltimore Maryland 962-2840 21201 For your information I also have enclosed two technical publications concerning asbestos and occupational health If you have any further questions please let me know Sincerely Enclosures Kenneth M. Wallingford Physical Science Aid Environmental Investigations Branch DFSCI CC Mr. William Shoemaker Regional Program Director NIOSH Region III NIOSH AUTOMOBILE BRAKE STUDY OBJECTIVES AND PROCEDURE II III The objectives of the study are to determine whether there is a significant asbestos dust exposure level during brake servicing In order to accomplish this objective the following shall be done 1 weighted average exposures of the mechanics shall be determined during the whole servicing period 2 Periods of peak exposures shall be identified with particular servicing operations 3 General air samples shall be taken to determine exposures to anyone who might be in the area other than the mechanic 4 Characteristics of the atmospheric dust shall be determined i.e. fiber size distribution % asbestos etc. Atmospheric Sampling In general all sampling whall be done in the same manner as all ourpast asbestos sampling In addition to our usual method of sampling each mechanic will be asked to wear two personal pumps simultaneously One pump and filter arrangement shall be used to get a weighted average exposure Filters on the other pump shall be changed after each of the following operations in order to distinguish operations creating peak exposures 7. 7. brake drum removal 4 Worn brake plate Old lining assembly removal cleaning compressed air removal and new lining assembly for those shops which process riveted linings 6. . Replacement of new brake assembly 6. Brake drum cleaning and assembly In addition to determining the personal exposure of the mechanics several pumps shall be used to determine general air concentrations within the shop These pumps will probably operate at 2.0 liters per minute in order to sample more air in a shorter period of time Analysis of samples obtained Samples which are collected are to be analyzed as follows 1 Counts for both fibers and grains shall be made with the standard asbestos counting procedure using phase contrast illumination 2 Samples shall be analyzed for the presence of asbestos using the ray diffraction technique described by Crable and Knott.1 : - Automobile Automobile Brake Study Objectives Objectives and Procedure JanuaryJanuary 20 1972 Page 2 3 Electron - micrographs shall be made in order to use the criteria for asbestos fiber identification presented by Gross eta2l 4 Fiber size distributions shall be determine using a particle size analyzer IV Reporting of results Results of the study shall be compiled in as short a period as possible so that a written paper may be presented REFERENCES Gross Paul M.D. RoberRobert t T.P. deTreville M.D. Sc.D. and N. Martin N. Haller AsbeAsbesstos tos Versus Nonasbestos Fibers Archives of Environmental Health Vol 20 May 1970 Crable John V. and Marta J. Knott Quantitative ray Diffraction Analysis of Chrysotile Amosite and Crocidolite in American Industrial Hygiene Association Journal June 1966 a DIVISION OF FIELD STUDIES AND CLINICAL INVESTIGATIONS ENVIRONMENTAL INVESTIGATIONS BRANCH GARAGE SURVEY RESULTS FOR co ty ho yt wed uM ASBESTOS AND LEAD SURVEY DATE 1/28/72 OPERATION Air Blowing Front Drums Air Blowing Front Drums General Air During Air Blowing . Air Biowing kear trum Air Blowing Rear Dime Assembly Assembly General Air During Assembly ASBESTOS CONC LEAD 0.00 0.80 0.60 , . 4.7 0.95 3.00 2.34 2.10 0.20 0.03 0.20 0.01 0.00 0.01 TIMEMINUTES -- 5 15 4 5 20 4 20 F3 28 These fibers identified by phase contrast microscopy No chrysotile ray pattern was detectable in a bulk of the lining dust only : samplies ** The present OSHA standard for airborne inorganic lead is 0.2 mon an hour time weighted average basis