Health Hazard Evaluation Report No. HETA 81-128-1107, Janesville Products, Brodhead, Wisconsin

摘要

Personal breathing-zone air samples showed TDI concentrations ranging from non-detectable to 0.001 ppm (NIOSH criterion-0.005 ppm TWA, 0.02 ppm ceiling). Two area air samples collected in the repair area Showed TDI levels of 0.004 and 0.006 ppm. All samples collected for MDI were below the analytical limit of detection. Ceiling concentrations for methylene chloride ranged from 5.8 to 399 ppm, (NIOSH criterion 500 ppm ceiling, 75 ppm TWA) Time-weighted average (TWA) values for long-term samples of methylene chloride ranged from 4.7 to 39.5 ppm, with the highest exposures found in the repair area. NIOSH investigators determined that a potential toxic exposure to the combined effects of methylene chloride and carbon monoxide within the repair area was alleviated through engineering controls. Although a number of workers were reported as being sensitive to TDI, no definitive statements concerning chronic pulmonary effects from TDI exposure can be made. To reduce the possibility of future exposures, recommendations for continued environmental and medical surveillance are incorporated in the body of the full report.