How do I find a chemical's CAS name and number?

The CAS Chemist Consultation Service can find a CAS number and name for a fee. CAS also has a limited free online resource called Common Chemistry

You may also find CAS numbers Safety Data Sheets (SDS) and chemical catalogues.

Some international government agencies also maintain chemical databases such as the European Chemicals Agency (opens in a new window).

Last update 2 January 2019