Hazard evaluation of mixtures containing established mutagens.

OSHA interpretation letter responding to questions on hazard evaluation of mixtures with mutagenic ingredients under the Hazard Communication Standard, 29 CFR 1910.1200. It states that in vitro tests alone do not establish a health hazard and that the standard does not require testing, and cites reporting thresholds of 0.1% for carcinogens and 1% for other health hazards.