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NIOSH Testimony on Occupational Exposure to 4,4'-Methylenedianiline (MDA) by R. W. Niemeier, July 11, 1989.
NIOSH 1989 Jul:9 pages
This testimony demonstrates that NIOSH supports OSHA in developing a proposed rule for 4,4'-methylenedianiline (101779) (MDA) exposure which uses the proceedings from the MDA Mediated Rulemaking Advisory Committee. NIOSH supports a proposed permissible exposure limit of 10 parts per billion (ppb) and a short term exposure limit of 100ppb. However, because NIOSH has stated that MDA is a potential carcinogen, NIOSH continues to recommend that occupational exposures be reduced to the lowest feasible level. OSHA should consider recently published data on the assessment of workers exposed to MDA when planning the biological monitoring phase of the proposed rule. The finding of metabolites in the urine of workers involved in the production of epoxy hardeners, impregnation of carbon fiber mats, and the use of silk screening of seals and gaskets was discussed. Also considered were respiratory protection, chemical protective clothing, sampling and analytical methods, and medical surveillance.
NIOSH-Author; NIOSH-Testimony; Niemeier-R-W; Hepatotoxicity; Carcinogens; Bladder-cancer; Skin-exposure; Inhalants; Organic-vapors;
NTIS Accession No.
NIOSH, 9 pages, 14 references
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division