Document xjeKEqkgpmJErQJ8r4qBZRbLm

FILE NAME Packings and Gaskets PAG DATE 2006 DOC PAG001 DOCUMENT DESCRIPTION Published Journal Abstract fle Dr. Barry Castleman From To Sent Subject James Huff huff1@niehs.nih.gov barry castleman bcastleman@earthlink.net joe ladou joeladou@aol.com peter infante pinfante@starpower.net morando soffritti crcfr@ramazzini.it phil landrigan phil.landrigan@mssm.edu morrisgreenberg mgreenberg@toucansurf.com lorenzo tomatis Itomatis@hotmail.com Thursday March 09 2006 11:38 AM Paustenbach - Chrysotile asbestos exposure re automobile exhaustsystems Journal of Exposure Science and Environmental Epidemiology 2006 16 156-171 Chrysotile asbestos exposure associated with removal of automobile exhaust systems ca. 1945-1975 by mechanics Results of a simulation study Dennis ] Paustenbacha Amy K Madla Ellen Donovana Katherine Clarka Kurt Fehlinga and Terry C Leeb 1. aChemRisk Inc. San Francisco CA USA 2. bCarolina EHS Lake Wylie SC USA Correspondence A.K. Madi ChemRisk Inc. 25 Jessie Street at Ecker Square Suite 1800 San Francisco CA 94105 USA Tel +1 415 896 2400. Fax +1 415 896 2444. mail amadl@chemrisk.com Received 4 April 2005 Accepted 27 June 2005 Published online 2 November 2005 Top of page Abstract For decades containing gaskets were used in virtually every system that involved the transport of fluids or gases Prior to the 1970s some automobile exhaust systems contained asbestos gaskets either at flanges along the exhaust pipes or at the exhaust manifolds of the engine A limited number of automobile mufflers were lined with asbestos paper This paper describes a simulation study that characterized personal and bystander exposures to asbestos during the removal of automobile exhaust systems ca. 1945-1975 containing asbestos gaskets A total of 16 1974 vehicles with old or original exhaust systems were studied Of the 16 vehicles 12 contained asbestos gaskets in the exhaust system and two vehicles had asbestos lining inside the muffler A total of 82 samples 23 personal 38 bystander and 21 indoor background were analyzed by Phase Contrast Microscopy PCM and 88 samples 25 personal 41 bystander and 22 indoor background by Transmission Electron Microscopy TEM Only seven of 25 worker samples analyzed by TEM detected asbestos fibers and 18 were below the analytical sensitivity limit mean 0.013 cc range 0.001-0.074 cc Applying the ratio of asbestos fibers fibers including asbestos as determined by TEM to the PCM results showed an average 1 h adjusted PCM worker exposure of 0.018 cc 0.002-0.04 cc The average 1 h adjusted PCM airborne concentration for bystanders was 0.008 cc range 0.0008-0.015 cc Assuming a mechanic can replace four automobile single exhaust systems in 1 workday the estimated 8 weighted average TWA for a mechanic performing this work was 0.01 cc Under a scenario where a mechanic might repeatedly conduct exhaust work these results suggest that exposures to asbestos from work with automobile exhaust systems during the 1950s through the 1970s containing asbestos gaskets were substantially below 0.1 cc the current PEL for chrysotile asbestos and quite often were not detectable Keywords chrysotile asbestos gasket automobile exhaust system mechanic occupational exposure 3/9/2006