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Producer:Chemical Abstracts Service, U.S.A
Coverage:1907-present plus more than 180,000 pre-1907 records
File Size:More than 45 million records (03/2017)
Updates:Daily updates with bibliographic data; weekly updates with indexing data
File Type:Bibliographic
Content:Biochemistry, chemistry and chemical engineering

Chemical Abstracts Plus (CAplusSM) is the most current and comprehensive chemistry bibliographic database available from Chemical Abstracts Service (CAS). HCAplus covers international journals, patents, patent families, technical disclosures, technical reports, books, conference proceedings, dissertations, electronic-only journals, and web preprints from all areas of chemistry, biochemistry, chemical engineering, and related sciences from 1907 to the present, as well as over 110,000 records for patents and journal articles dated before 1907.

Cited references are included for journals, conference proceedings, and basic patents from the US, EPO, WIPO, and German patent offices added to the CAS databases from 1997 to the present. Also included are patent examiner citations from British and French basic patents (2003 to the present) and Canadian patents (2005 to the present).

Bibliographic information and available abstracts for the articles from nearly 1,500 key chemical journals are added within 1 week of journal receipt. HCAplus is updated daily with new bibliographic records and weekly with indexing.

HCAplus contains thesauri in the following fields: Classification Code (/CC), Company Name (/CO), Controlled Term (/CT), F-Term (/FTERM), International Patent Classifications (/IPC), National Patent Classifications Current (/NCL), National Patent Classifications Issue (/INCL), and Role (/RL).

Three pricing options are available:

  • low connect-hour with search-term charges
  • connect-hour with no search-term charges (HCAplus file)
  • no connect-hour charge with higher search-term charges (ZCAplus file).


Chemical Abstracts Service
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P. O. Box 3012
Columbus, Ohio 43210-0012
Phone: (+1) 614-447-3700
Telefax: (+1) 614-447-3751
Email: help(at)cas(dot)org

Usage Terms

The CAS Information Use Policies which apply to your use of the HCAPLUS 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.