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​What is CAS REGISTRY?
​CAS REGISTRY is the most authoritative collection of disclosed chemical substance information, containing more than 126 million organic and inorganic substances and 66 million sequences.
CAS REGISTRY covers substances identified from the scientific literature from 1957 to the present, with additional substances going back to the early 1900s.

What is a CAS Registry Number (CAS)?
Each CAS Registry Number®  identifier:
Is a unique numeric identifier
Designates only one substance
Has no chemical significance
Is a link to a wealth of information about a specific
​chemical substance.

What does a CAS Registry Number look like?
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?
A CAS Registry Number is assigned to a substance when it enters the CAS REGISTRY database. Numbers are assigned in sequential order to unique, new substances identified by CAS scientists for inclusion in the database.

What kinds of compounds does the CAS REGISTRY contain?
CAS REGISTRY contains a wide variety of substances, including the world's largest collection of:
Organic compounds · Inorganic compounds · Metals
Alloys · Minerals · Coordination compounds
Organo-metalics · Elements · Isotopes
Nuclear particles · Proteins and nucleic acids · Polymers
Non-structurable materials (UVCBs)

How frequently is the CAS REGISTRY database updated?

Approximately 15,000 new substances are added each day.

 
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