Overview
A Safety Data Sheet tells you how to handle a chemical safely. It is a structured document with 16 sections, and the format is set by REACH. You may also see the older name MSDS, material safety data sheet.
The sheet pulls together the hazards, the precautions, first-aid and firefighting measures, storage advice and disposal guidance for a chemical. The hazard classification it reports follows CLP.
Substances and mixtures, not articles
An SDS is written for a substance or a mixture, the chemicals themselves. It is not written for an article, meaning a finished object whose shape defines its function more than its chemistry. A bottle of solvent gets an SDS; a moulded plastic part on its own does not.
If you are looking at a finished part rather than a chemical, an SDS usually does not apply. Article-level duties come through REACH instead.
Extended SDS
For substances registered under REACH, the sheet can come with exposure scenarios attached, describing the conditions for safe use. This longer version is called an extended SDS, or eSDS.
Note: general educational information, not legal advice. Check the official source before relying on it.