CAS Number

CAS Number

A CAS Number (pronounced /kæs/ number), also known as Chemical Abstracts Service number, is a unique numerical identifier assigned by the Chemical Abstracts Service to every chemical substance described in the open scientific literature (including organic and inorganic compounds, minerals, isotopes, alloys and nonstructurable materials).

Etymology

The term "CAS Number" is derived from the Chemical Abstracts Service, a division of the American Chemical Society. The Chemical Abstracts Service has developed an extensive database of chemical compounds and sequences, which is referred to as the CAS Registry. Each entry in this registry is assigned a unique CAS Registry Number.

Related Terms

• Chemical Abstracts Service
• American Chemical Society
• CAS Registry
• Chemical compound
• Chemical substance

Usage

CAS Numbers are used internationally in scientific databases and regulatory documents to identify chemical substances. They are used by researchers, industry professionals, and regulatory bodies worldwide to ensure a consistent way of identifying and tracking chemical substances.

Format

A CAS Number is a simple, unique numeric identifier. It does not contain any inherent chemical significance but provides an unambiguous way to identify a chemical substance or mixture when there are many possible systematic, generic, proprietary or trivial names. CAS Numbers consist of up to 10 digits that are divided into three parts by hyphens. The first part, consisting of two or three digits, is followed by a second part consisting of two digits, and a single digit at the end serves as a check digit.

See Also

• International Union of Pure and Applied Chemistry
• IUPAC nomenclature
• Chemical nomenclature
• Chemical formula
• Chemical structure

External links

• Medical encyclopedia article on CAS Number
• Wikipedia's article - CAS Number

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