A M.S.D.S. stands for Material Safety Data Sheet. It is a document that provides detailed information about the potential hazards and safety precautions for a specific chemical or substance. The MSDS typically includes information about the physical and chemical properties of the substance, its potential health effects, proper handling and storage procedures, emergency response measures, and disposal guidelines. It is an important resource for workers and emergency responders to understand the potential risks associated with a particular substance and how to safely handle and use it.