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Industrial hygiene survey report of the P. D. George Company, St. Louis, Missouri.
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, IWS 143-22, 1988 Nov; :1-13
In an attempt to gather information related to employee exposure to 4,4'-methylenedianiline (101779) (MDA) in a batch type mixing operation, a visit was made to the P. D. George Company (SIC-3079), St. Louis, Missouri. At this site imide ester resin was manufactured for wire coating. The process was performed as a batch operation in which large amounts of pure MDA were used. The study indicated that airborne dust was generated during the dumping of MDA into the reactor's loading chute but that personal protection eliminated much of the respiratory hazard. Contamination of the workplace and poor work practices both probably resulted in dermal exposure, but this was not confirmed by actual measurement. Urine samples were all negative for MDA at the detection limits of 1.0 parts per billion, suggesting that exposures were not sufficient to be detected by this method. The authors recommend that decontamination procedures be implemented and performed after MDA is used. Dry cleanup should be performed with a vacuum installed with a HEPA filter and final decontamination should be performed with a methanolic solution of p-dimethylaminobenzaldehyde. Workers must wear full personal protective equipment while handling MDA. These garments must not be reworn or stored with street clothes. Workers should wash and shower after handling MDA.
NIOSH-Author; NIOSH-Survey; Field-Study; Region-7; IWS-143-22; Amines; Plastics-industry; Epoxy-resins; Skin-exposure; Urinalysis; Air-quality-monitoring; Carcinogens; Personal-protective-equipment
Field Studies; Industry Wide
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division