New on STN

November 2015

Change to PI field in CAplus records

November 2015

Derwent Markush Resource now available on the new STN platform!

September 2015

New Version of Emtree Introduces over 800 New Terms to Embase on Classic STN and New STN

STN User Meetings

Erfurt, 01.12.2015
Essen, 26.04.2016
Frankfurt, 11.05.2016



 Summary Sheet


Producer:Chemical Abstracts Service (CAS), U.S.A.
Coverage:1907-present plus over 180,000 pre-1907 records
File Size:More than 35.2 million records (04/2015)
File Type:Bibliographic
Content:Chemistry, biochemistry, and chemical engineering

The Chemical Abstracts database covers all areas of biochemistry, chemistry and chemical engineering, and related sciences. CA contains records for documents reported in printed Chemical Abstracts (CA) from 19th century to the present. Sources include over 8,000 journals, patents from 38 national patent offices and two international patent organizations, technical reports, books, conference proceedings, and dissertations. Electronic-only journals and Web preprints are also covered. Bibliographic terms, indexing terms, roles, CAS Registry Numbers, International Patent Classification, and abstracts are searchable. Cited references are included for journals, conference proceedings and basic patents from US, EPO, WIPO and German patent offices added to the CAS databases from 1999 to the present. Page images for the CA abstracts from 1907-1967 are displayable. A learning file, LCA, is available. CA contains thesauri for records from 1967 to the present in the Controlled Term (/CT) field for the CA Lexicon, in the Role (/RL) field for the CAS roles, and in the International patent Classification fields, as well as a Company Name Thesaurus. In addition, a thesaurus is also available for CA Sections for records from 1907 to the present.

Three pricing options are available:

  • low connect hour with search term charges;
  • connect hour with no search term charges (HCA file);
  • and no connect hour charge with higher search term charges (ZCA file).


Chemical Abstracts Service
2540 Olentangy River Road
P. O. Box 3012
Columbus, Ohio 43210-0012
Phone: (+1) 614-447-3600
Fax: (+1) 614-447-3713
Email: help(at)cas(dot)org
Copyright Holder: American Chemical Society (ACS)

Usage Terms

The CAS Information Use Policies which apply to your use of the CA File on STN are explained in detail.

Contents of CAS Information Use Policies

Part 1:
I. Introduction
II. Definitions

Part 2:
III. Authorized Use of CAS Information

Part 3:
IV. Unauthorized Use of CAS Information
V. Special Permission
VI. Further Information

Further details on the STN Information Keep & Share Program.