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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 numbers are copyrighted by the American Chemical Society. Redistribution rights for CAS registry numbers are reserved by the American Chemical Society.

The ChemIndex database is a free tool for finding information on over 1,800,000 distinct chemical substances. Search on CAS registry numbers, chemical names or name fragments. A free and …

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 …

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

Oct 8, 2024 · What is a CAS Number? A CAS number is a unique identifier assigned to every chemical substance described in the open scientific literature. This number, typically comprising up to ten …

Mar 30, 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 …

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