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CAS REGISTRY^SM - The world's largest substance database

CAS REGISTRY, the "gold standard" for substance information, is the only integrated comprehensive source of chemical information from a full range of patent and journal literature that is curated and quality controlled by scientists.

For more than 100 years, CAS scientists have meticulously analyzed and indexed publicly disclosed global scientific information to build up the unique REGISTRY resource that provides not only chemical names, the unique CAS Registry Number, and vital literature references but also ancillary information such as experimental and predicted property data (boiling and melting points, etc.), commercial availability, preparation details, spectra, and regulatory information from international sources.

Benefit to you

You can obtain the information you need for millions of substances from the most current and reliable collection of chemical substance information in the world.

Content

CAS REGISTRY, produced by CAS, is the most authoritative collection of disclosed chemical substance information.

• More than 51 million organic and inorganic substances and more than 61 million sequences 
• Updated daily

REGISTRY contains information about the many different types of substances that have been reported over the years in the scientific literature:

Alloys Coordination compounds Minerals Mixtures

Polymers Salts Sequences

Substances meet the following criteria that maintain the high quality and reliability of information in REGISTRY:

• Identified by CAS as coming from a reputable source, including but not limited to patents, journals, chemical catalogs, and selected substance collections on the web
• Described in largely unambiguous terms
• Characterized by physical methods or described in a patent document example or claim
• Consistent with the laws of atomic covalent organization

Each substance is identified by a CAS Registry Number.

Information pertaining to these substances has been enriched with experimental and predicted property data with more than 2.7 billion property values, data tags, and spectra:

	Experimental	Predicted
Properties	4 million (for 2.6 million substances)	2.6 billion (for 40 million substances)
Spectra	713,000 (for 480,000 substances)	33.6 million 13C-NMR and 33.6 million 1H-NMR (available in SciFinder)
Data Tags	8.8 million (for 2.9 million substances)	N/A

Coverage

1957 to the present, with additional substances going back to the early 1900s

Substance information is added to REGISTRY from several different sources:

• The CAS Registry System - the computer system that automatically identifies and catalogs all substance information* that CAS selects from journal articles, patents, conference proceedings, and other published sources to include in Chemical Abstracts (CA)
• GenBank (registered trademark of the U.S. Department of Health and Human Services) - a database repository containing millions of sequences*
• Special collections of substance data
  • Substance information listed on various international, national, and state regulatory inventories and lists such as TSCA or EINECS to which CAS has assigned CAS Registry Numbers
  • Experimental property data collected by CAS scientists in the course of monitoring the scientific literature and from selected other sources
  • Values for calculated properties obtained using CAS data and software from ACD/Labs, Toronto, Canada

*See CAS Coverage of Prophetic Substances
and CAS Coverage of Sequences

Update frequency

• Updated daily with thousands of new substances.

CAS products

You can use the following CAS products to search the CAS REGISTRY:

• SciFinder
• STN