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HHE determination report no. HHE-79-45-649, The Timken Company, Canton, Ohio.

Authors
McQuilkin-SD
Source
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HHE 79-45-649, 1979 Dec; :1-13
NIOSHTIC No.
00092889
Abstract
Air samples were analyzed for the presence of crystalline-silica (7631869) (free silica), mineral wool fibers, and coal tar pitch volatiles (CTPV) at The Timken Company (SIC-2865), in Canton, Ohio on February 12 and 13, 1979 and May 21, 1979. An evaluation request came from the United Steelworkers of America, Local Number 1123, on behalf of the pithand workers engaged in mold cleanout and preparation activities at the stripper building. The quartz (14808607) concentrations of free silica in the air ranged from 123 to 286 micrograms per cubic meter which exceeded the OSHA respirable dust permissible exposure limit of 10 milligrams per cubic meter (mg/m3) of air divided by the percentage of quartz plus 2. The bulk refractory material used in the operation did not contain asbestos (1332214) or fibrous glass, but did contain a mineral wool fiber of monocalcium-silicate (37323903), which was identified as the probable cause of skin irritation reported in 12 confidential employee interviews. Analysis of the powdered CTPV indicated concentrations of benzene extractables of 0.03 to 0.118mg/m3, which were below the OSHA standard of 0.2mg/m3. The author concludes that at the survey time, pithand employees were exposed to hazardous concentrations of free silica, an inadequate respiratory protection program was in effect, and the CTPV mixture contained known and suspected carcinogens. They recommend implementation of engineering and administrative controls to reduce employee exposures to hazardous materials, particularly the installation of a negative pressure vacuum system for mold cleanout.
Keywords
NIOSH-Author; Hazards-Confirmed; HHE-79-45-649; NIOSH-Health-Hazard-Evaluation; Iron-and-steel-foundries; Steel-workers; Air-sampling; Silica-dusts; Exposure-limits; Skin-irritants; Respiratory-protection; Control-measures; Unions; Region-5; Author Keywords: crystalline silica; free silica; mold cleanout
CAS No.
7631-86-9; 14808-60-7; 1332-21-4; 37323-90-3
Publication Date
19791201
Document Type
Field Studies; Health Hazard Evaluation
Fiscal Year
1980
NTIS Accession No.
PB80-163264
NTIS Price
A03
Identifying No.
HHE-79-45-649
NIOSH Division
DSHEFS
SIC Code
2865
Source Name
National Institute for Occupational Safety and Health
State
OH
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