Why is a SDS used?
The purpose of a Safety Data Sheet (SDS), formerly known as Material Safety Data Sheets (MSDS), is to provide information on the hazards of working with a chemical and procedures that should be used to ensure safety. SDSs are a primary source of information regarding chemical hazards and handling.
You can find details as given in below link
https://en.wikipedia.org/wiki/Safety_data_sheet
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