HHE Determination Report No. HHE-80-113-114, Mobay Chemical Corporation, Plastics and Coatings Division, Pittsburgh, PA.
Environmental and personal air samples from the Southern Ohio Coal Company's Meigs 1 mine (SIC-1211), near Longsville, Ohio, were collected and analyzed from July 7 to 9, 1980, to determine concentrations of isocyanates produced during injection of a polyurethane binder used in underground coal mine roof consolidation. The evaluation was requested by the management of the Mobay Chemical Corporation, Pittsburgh, Pennsylvania, who was seeking authorization for use of the system in the St. Clairsville Mine Safety and Health Administration Subdistrict. Seventy four samples were collected in a 2.5 hour period during which 2,800 pounds of the binder were injected. No measurable concentrations of diphenylmethane-diisocyanate (101688) (MDI) or phenyl-isocyanate (103719) were detected. The investigators note that standard for MDI is a time weighted average concentration of 0.005 parts per million (ppm), with a ceiling concentration of 0.02ppm. Standards for phenyl isocyanate have not been established. They conclude that the extremely low airborne concentrations of isocyanates are hazardous to the miners. They recommend that the guidelines in the NIOSH diisocyanate criteria document be followed when exposures to isocyanates in underground coal mines equal or exceed 50 percent of the proposed permissible concentrations, and suggest design and procedural changes in the injection process.
NIOSH-Author; HHE-80-113-114; NIOSH-Health-Hazard-Evaluation; Hazards-Unconfirmed; Region-3; Health-surveys; Air-sampling; Coal-mining;
Hazard Evaluation and Technical Assistance;
NTIS Accession No.
Environmental Investigations Branch, NIOSH, Morgantown, West Virginia, 13 pages, 10 references