• Publication Date:
  • Publication Type:
    Proposed Rule
  • Fed Register #:
  • Standard Number:
  • Title:
    4,4'-Methylenedianiline (MDA)
Based on animal and human data, OSHA has determined that exposure to
MDA at the current occupational exposure levels causes adverse
effects on health. OSHA is proposing new standards that will: limit
occupational exposure to MDA to an eight-hour time weighted average
(TWA) of 10 parts per billion (ppb), establish a short-term exposure
limit (STEL) of 100 ppb, and implement associated provisions. In
addition to establishing permissible exposure limits (PELs) for MDA,
this regulation includes requirements such as medical surveillance,
exposure monitoring, hygiene facilities, engineering controls and
work practices, proper respirator use, and recordkeeping. An action
level of 5 ppb is included.