The primary source for those who need to evaluate the hazardous potential of substances used in commerce. Combines data on toxicological, flammability, reactivity, explosive potential, and regularity information on approximately 26,000 substances, including 2600 new entries. Also includes Immediately Dangerous Life or Health (IDLH) levels for approximately 1,000 chemicals. It also covers exposure-level classifications for a number of regulatory agencies, from OSHA to the U.S. Department of Transportation. Especially important in areas of industrial hygiene, safety, emergency response, law, and policy making.