A document that is part of the materials information system and accompanies the product. Prepared by the manufacturer, the MSDS provides information regarding the safety and chemical properties and (if necessary) the long-term storage, handling, and disposal of the product. Among other factors, the MSDS describes the hazardous components of a product; how to treat leaks, spills, and fires; and how to treat improper human contact with the product. Also see: Hazardous Materials.