Material Safety Data Sheets provide workers and emergency personnel with procedures for working with or handling certain substances. MSDS documents contain boiling point, safety gear needed and other information pertaining to a substance.
The Occupational Safety and Health Administration requires that MSDS documentation be provided for employees and emergency personnel when they may come into contact with chemicals that endanger their health. The Environmental Protection Agency, as well as state and local agencies, have laws concerning the use of MSDS documents with certain potentially hazardous chemicals.
Articles that contain hazardous chemicals but do not release these chemicals under normal use, such as a copper wire, may be exempt from needing an MSDS. Food additives, cosmetics and pharmaceuticals are exempt in most circumstances, as well.
Some clients may insist on MSDS documents being created on products not required by law to have one. A letter stating that the chemical in question has been evaluated by OSHA and deemed not hazardous may put the client at ease and save you unnecessary work.