CAS registry number
CAS Registry Number
A CAS Registry Number (pronounced /kæs/ 'kas', /rɛdʒɪstri/ 'registry', /ˈnʌmbər/ 'number'), also known as a CASRN or CAS Number, is a unique numerical identifier assigned by the Chemical Abstracts Service (CAS) to every chemical substance described in the open scientific literature (including organic and inorganic compounds, minerals, isotopes, alloys and nonstructurables).
Etymology
The term "CAS Registry Number" is derived from the name of the organization that assigns these numbers, the Chemical Abstracts Service. The word "registry" refers to the comprehensive database of these numbers, and "number" refers to the unique identifier assigned to each chemical substance.
Function
The primary function of a CAS Registry Number is to provide a unique, unambiguous identifier for chemical substances. This is useful in database searches, as it allows for precise identification of a substance without the ambiguity that can arise from chemical nomenclature.
Format
A CAS Registry Number is separated by hyphens into three parts: the first part, consisting of two to seven digits; the second part, consisting of two digits; and the third part, a single digit serving as a check digit. The number is assigned in a sequential manner, meaning the structure of the number does not provide any information about the chemical substance it represents.
Related Terms
External links
- Medical encyclopedia article on CAS registry number
- Wikipedia's article - CAS registry number
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