Q. What is CAS and what do we do?

A. CAS is a division of the American Chemical Society (ACS) and is dedicated to the ACS vision of improving people's lives through the transforming power of chemistry. The CAS team of highly trained scientists identifies, aggregates, and organizes all publicly disclosed chemistry information, creating the world's most valuable collection of content that is vital to innovation worldwide. Scientific researchers, patent professionals and business leaders around the world rely on a suite of research solutions from CAS to enable discovery and fuel innovation. CAS is located in Columbus, Ohio.

Q. Who do I contact if I have a question or problem?

A. The CAS Customer Center is the central source for all inquiries. They can assist with general questions about CAS products and services, account setup and status, billing information, obtaining user documentation, and they can assist in developing search strategies when using CAS products.

Operating hours for the CAS Customer Center are 8am – 6pm US Eastern Time, (Monday-Friday)

Q. What is a CAS Registry Number®

A. CAS Registry Numbers (often referred to as CAS RN® or CAS Numbers) are universally used to provide a unique, unmistakable identifier for chemical substances. A CAS Registry Number itself has no inherent chemical significance but provides an unambiguous way to identify a chemical substance or molecular structure when there are many possible systematic, generic, proprietary or trivial names.

CAS Registry Numbers are used in many other public and private databases as well as chemical inventory listings and, of course, are included in all CAS-produced databases.

Q. How can a publication get abstracted/indexed by CAS?

A. Our selection team of chemists determines whether a journal meets our editorial criteria for abstracting and indexing in the CAS databases. Publishers interested in having a journal covered in the CAS databases should:

  1. Complete and submit the Journal Information Form for journals published online, or
  2. For journals published in print, please send three different and recent issues to

Acquisitions Dept.
P.O. Box 3012
Columbus, OH 43210

Q. Does CAS provide any open chemical information resources?

A. CAS offers Common Chemistry, a free web resource that contains CAS Registry Numbers for approximately 7,900 chemicals of widespread general public interest. Common Chemistry is helpful for those who know either a name or CAS Registry Number of a common chemical and want to pair both pieces of information. CAS has collaborated with Wikipedia in developing this resource and encourages you to use the Wikipedia link (when available) or other sources of general information on chemistry, to learn more about these chemicals.

The CAS Source Index (CASSISM) Search Tool is another free online resource intended to support researchers and librarians who need accurate bibliographic information. Use this free tool to quickly identify or confirm journal titles and abbreviations for publications indexed by CAS since 1907, including serial and non-serial scientific and technical publications.  Locate the bibliographic details you need quickly and easily. Search by Title, Abbreviation, CODEN, ISBN, or ISSN.

Q. Where is CAS located, and do you have directions for visitors?

A. CAS is located at:
2540 Olentangy River Road
Columbus, OH

See this map and directions for visitors.


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