HHE Determination Report No. HHE-77-115-473, Heppenstall Company, Pittsburgh, Penns.
NIOSH 1978 Mar:12 pages
An investigation in the manufacturing of steel forgings (SIC-3325) has been made at the Heppenstall Company concerning worker exposure to Fiberfrax, a ceramic fiber insulation. Bricklayers and helpers, and occasionally laborers, during the installation of Fiberfrax in heat treat furnaces complained of coughing spasms, sore throats, and skin irritation. Because Fiberfrax was being used as a thermal barrier during welding repair of die blocks, the evaluation was expanded to include this operation. The potential exposures to silica (7631869) and total and respirable particulate by bricklayers were evaluated. Additionally, exposure to iron-oxide (1317619) fume by welders during repair of a cracked die block was evaluated. Personal breathing zone samples were collected to evaluate the bricklayers' and helpers' exposures to quartz (1317799) and cristobalite and respirable and total dust. Health questionnaires were completed on six workers (four bricklayers and two welders). This constituted 100 percent of the total workers (six males) exposed. The bricklayers and workers are experiencing short term toxicity characterized by irritation of exposed skin areas, and less frequent symptoms of mucous membrane irritation. Health effects data concerning long term exposure to airborne Fiberfrax was not available. Bricklayers were exposed to airborne quartz levels exceeding the federal standard and to excessive levels of total particulate during replacement of two gas burners in the heat treat furnace. The welders were not exposed to toxic concentrations of metallic oxide fume during repair of a cracked die block.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; HHE-77-115-473; Hazard-Confirmed; Region-3; Air-sampling; Ceramic-materials; Furnace; Air-contamination; Oxides; Silicon-dioxide; Fibers; Tridymite; Industrial-hygiene; Steel-industry; Occupational-health; Welders; Bricklayers;
7631-86-9; 1317-61-9; 1317-79-9;
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Hazard Evaluations and Technical Assistance Branch, NIOSH, Cincinnati, Ohio, HHE-77-115-473, 12 pages