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A CAS Registry Number (also referred to as CAS RN or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.
A CAS Registry Number is a numeric identifier that can contain up to 10 digits, divided by hyphens into three parts. The right-most digit is a check digit used to verify the validity and uniqueness of the entire number. For example, 58-08-2 is the CAS Registry Number for caffeine. How does CAS assign Registry Numbers?
Find thermodynamic and other data for chemical species by CAS registry number. Enter a registry number, select units and data types, and click search to access NIST Chemistry WebBook.
CAS Numbers are up to 10 digits long using the format xxxxxxx-yy-z. They are assigned to a compound as the CAS registers a new compound. The number has no significance to the chemistry, structure, or chemical nature of the molecule. The CAS Number of a compound is a useful way to identify a chemical over its name.
Find the CAS registry number, chemical name, formula and structure of various chemical compounds. Search by cas number, chemical name or formula and get molecular information, synonyms and molecular weight.
A CAS Registry Number is a unique and unambiguous identifier for a specific substance that allows clear communication and, with the help of CAS scientists, links together all available data and research about that substance.
CAS Common Chemistry is an open community resource for accessing chemical information from CAS REGISTRY. You can search by chemical compound name, SMILES, INCHI or CAS Registry Number, such as aspirin sodium chloride, 58-08-2.
