CAS REGISTRY®, the CAS substance collection, is the premier source relied upon by scientists and regulators worldwide for accurate information on chemical substances.

CAS Registry Numbers (CAS RN) are simple and regular, convenient for database searches. They offer a reliable, common and international link to every specific substance across the various …

“CAS registry” is a registered trademark of the American Chemical society.

Quickly confirm chemical names, CAS Registry Numbers®, structures or basic physical properties by searching compounds of general interest or leveraging an API connection.

Jan 13, 2026 · You can also identify your substance of interest by its CAS Registry Number®, which is universally used to provide a unique, unmistakable identifier for chemical substances.

Chemical products are described in many different ways including chemical structures, generic, molecular formulas, systematic, common, and trade names.

Aug 11, 2019 · Every chemical is assigned a CAS Number. Have you ever wondered what a CAS Number is and how they are assigned? Check out this very simple explanation that will give you …

Chemical Abstracts Service (CAS), a division of the American Chemical Society, assigns these identifiers to every chemical that has been described in the literature.

Look up CAS in Wiktionary, the free dictionary. CAS, CaS, or cas may refer to:

Feb 4, 2026 · The CAS reference collection aggregates and connects scientific knowledge from thousands of journals and other sources published globally in more than 50 languages dating back to …