Asbestos Emissions from Brake Dynamometer Tests 730549
Dynamometer tests of a production disc brake provided new information on asbestos fiber emissions during break-in, normal use, and high temperature use conditions. Both ambient air and brake cooling air were sampled isokinetically, using 0.45 μm filters. Examination of test and background filters required a clarification process to maximize fiber detectability, the use of transmission electron microscopy (at 40,000X) for detection, and electron diffraction for positive identification of asbestos fibers. Most of the lining asbestos was found to be converted to a nonfibrous material by the high flash temperatures of the braking surface. Less than 0.02% of the lining wear was released as asbestos fibers. The concentration of asbestos fibers in the urban atmosphere, due to brake usage, was conservatively estimated at less than 0.07 X 10-9 g/m3. Based on this upper bound, the use of brakes was judged to be not significant as a source of atmospheric asbestos.
Citation: Anderson, A., Gealer, R., McCune, R., and Sprys, J., "Asbestos Emissions from Brake Dynamometer Tests," SAE Technical Paper 730549, 1973, https://doi.org/10.4271/730549. Download Citation
Author(s):
A. E. Anderson, R. L. Gealer, R. C. McCune, J. W. Sprys
Affiliated:
Scientific Research Staff, Ford Motor Co.
Pages: 10
Event:
National Automobile Engineering Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1973 Transactions-V82-A
Related Topics:
Disc brakes
Fibers
Microscopy
Emissions
Identification
Wear
Transmissions
Production
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