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The World's Leading Resource for Chemical Information!

CAS monitors, indexes, and abstracts the world's chemical literature and patents, updates this information daily, and makes it accessible through state-of-the-art information services.

Accessing CAS databases through STN International, SciFinder, STN Easy, and other services, you can search the only database of its kind that offers both chemistry-related literature AND patents:

Chemical Abstracts
Chemistry-related Literature and Patents

CA is the world's largest and most up-to-date collection of chemical information, with more than 15 million abstracts of journal articles, patents, and more.

Sources for CA include more than 8,000 journals, patents, technical reports, books, conference proceedings, and dissertations from around the world. About 13,000 records are added every week, with much of the information added to the database on a daily basis.

CA is an exceptional patent database, covering 29 national patent offices and two international bodies. About 16% of the CA database, over 2 million records, are from the patent literature. Details of patent coverage by CAS are available.

CAS Document References are Growing!

The number of documents abstracted and indexed in CA has been increasing dramatically, reflecting an overall worldwide increase in published scientific research and increased patent activity.

The number of documents added to CA in 1998 was about 700,000. The CAS Statistical Summary (~64k PDF file) has more details about the number of documents added to CA from 1907-1998.

CA--The Most Comprehensive Coverage of Chemistry

The editorial scope of CA is not limited to just organic chemistry!

CA provides comprehensive coverage of the world's chemical literature, and includes biochemistry, organic chemistry, macromolecular chemistry, applied chemistry and chemical engineering, physical, inorganic, and analytical chemistry. For details on the comprehensiveness of CA coverage, see The Sections of Chemical Abstracts.

CAS REGISTRY, the world's largest substance database--including the largest collection of organic substance records: total substances are now more than 19,000,000!

CAS REGISTRY

CAS Registry, the world's preeminent substance database, now contains more than 19,000,000 substance records, including more than 12,000,000 organic substances and 3,000,000 biosequences. The Registry is the world's largest collection of organic substance records.

The CAS Registry System is an international resource for chemical substance identification for scientists, industry, and regulatory bodies.

CAS REGISTRY is the largest file of substance information in the world containing structures and chemical names. It has become the worldwide authority for chemical substance identification.

CAS Registry Numbers®

CAS REGISTRY is your complete and reliable source of CAS Registry Numbers. These unique identifiers bridge the many differences in systematic, generic, proprietary, and trivial names, linking them with the correct molecular structure. A Registry Number itself has no inherent chemical significance. CAS Registry Numbers are included in all CAS databases and the full set of Registry database information--structures, names, formulas, ring data--is available for searching on STN. CAS Registry information is also available in CAS databases offered by other online system vendors. CAS Registry Numbers are used in many public and private databases, chemical inventories, and many reference works.

CAS REGISTRY File:
Comprehensive and Current!

New substances in the CAS Registry System grew from an average of 262,000 in the first 5 years to an average of 1,000,000 in the most recent 5 years. In 1997 alone, more than 1.3 million substances were added. Including information added retrospectively, CAS REGISTRY can be searched from 1957 to the present.

More Than 19 Million Substances Now Have CAS Registry Numbers!

Currency is a special strength of CAS. In an average working day, we add approximately 2,500 document records and 5,000 substance registrations. That amounts to a new substance registration every few seconds!

Substantial Growth from Patents, Paticularly Organic Patents, and Biological Journals (1994-1997)

For the past four years, 1994-1997, the annual growth of substance registrations from all patents has grown by about 13%.

Registrations from organic patents have grown by over 14%. By comparison, registrations from journals declined by a fraction of a percent, except for biological journals. Registrations from biological journals increased annually by more than 12%.