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

Benefit to you

You can obtain the substance information you need from 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

• Contains more than 36 million organic and inorganic substances and over 60 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 predicted and experimental property data.

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 Sequences

Update frequency

• Updated daily with approximately 12,000 new substance records

CAS products

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

• SciFinder and SciFinder Scholar
• STN