Regulations (Preambles to Final Rules) - Table of Contents
• Record Type: Occupational Exposure to 4,4' Methylenedianiline (MDA)
• Section: 0
• Title: Intro to 29 CFR Parts 1910 and 1926, Occupational Exposure to 4,4' Methylenedianiline (MDA)

DEPARTMENT OF LABOR

Occupational Safety and Health Administration

29 CFR Parts 1910 and 1926

[Docket No. H040]

Occupational Exposure to 4,4' Methylenedianiline (MDA)

AGENCY: Occupational Safety and Health Administration (OSHA), Labor.

ACTION: Final rule.

SUMMARY: By this document, the Occupational Safety and Health Administration is promulgating new standards regulating exposure to MDA. The basis for this action is a determination by the Assistant Secretary, based on animal and human data, that exposure to MDA at the current occupational exposure levels causes adverse effects on employee health including an increased risk of cancer and that limiting occupational exposure to MDA to an eight-hour time-weighted average (TWA) of 10 parts per billion (ppb), establishing a short-term exposure limit (STEL) of 100 ppb, and implementing associated provisions will significantly reduce this risk. 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 in this final standard as a mechanism for exempting employers from the obligation to comply with certain requirements, such as employee exposure monitoring, in instances where the employer can demonstrate that employee exposures are at or below the action level.

The standards apply to all industries covered by the OSH Act including general industry, construction, and maritime.

For the most part, the provisions adopted by OSHA in these final regulations were recommended by the MDA Mediated Rulemaking Advisory Committee (Committee).

Effective Date: These final rules shall become effective on September 9, 1992.

ADDRESSES: In compliance with 28 U.S.C. 2112(a), the A