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Health hazard evaluation report: HETA-84-405-1717, NIOSH Ridge building, Cincinnati, Ohio.
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HETA 84-405-1717, 1986 Jul; :1-16
The United Union of Roofers, Waterproofers and Allied Workers requested an evaluation of the application of roofing systems (SIC- 1761). Methylene-bisphenyl-isocyanate (101688) (MDI) and organic solvent exposures were investigated during the application of a polyurethane roofing system at the NIOSH Ridge Building, Cincinnati, Ohio. MDI monomer concentration in area samples ranged from nondetected to 74 microgram/cubic meter (microg/m3), while total reactive isocyanate group concentrations ranged from nondetected to 338microg/m3. Four of eight personal samples collected for MDI monomer showed positive results, with concentrations ranging from 2microg/m3 to 3.9microg/m3; comparison of sampling and analytical methods used suggested that the exposure may have been underestimated by a factor between 25 and 50. For monomeric MDI, the NIOSH recommended exposure level is 50microg/m3. The author concludes that the data strongly suggest overexposures to monomeric MDI and total isocyanates occurred during roofing application. Overexposures to solvents were not measured. The author recommends that positive pressure supplied air respirators should be used when applying polyurethane roofing. The use of protective gloves is recommended for those exposed to diisocyanates.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; Region-5; HETA-84-405-1717; Hazard-Confirmed; Organic-compounds; Organic-chemicals; Organic-solvents; Isocyanates; Roofing-industry; Roofing-and-sheet-metal-workers; Author Keywords: Roofing and Sheet Metal Work; methylene bisphenyl isocyanates; MDI; TRIG
Field Studies; Hazard Evaluation and Technical Assistance
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division