For substance identification or CAS Registry Number® assignment:
Use the Chemist Consultation Service when you need a CAS Registry Number or to find substance information for reports, proprietary files, online searching, confirmation for an International Nonproprietary Name (INN), or United States Adopted Name (USAN) application.
Supply us with substance names, CAS Registry Numbers, or structure diagrams (including a unique substance identifier limited to 20 alpha numeric characters), and our chemists will provide you with the following substance information:
- CAS Registry Numbers (new or existing)
- CA Index Names (new or existing)
- Substance definitions
- Molecular formulas
- Structure diagrams
- Synonyms
Avoid delays by reviewing CAS Registration Criteria Overview and Registry Number Info Requirements before submitting your request.
All requests are kept strictly confidential. Most requests are processed within 10 working days once all of the information for processing is received.
Please submit the Chemist Consultation Order Form and relevant chemical structure diagram/descriptive information by e-mail to expedite processing.
Note: A unique substance identifier is requested for each substance to facilitate matching the results to your input information. (For example, your internal substance ID such as tradename, product code or sequential numbering).
Contact Us
For more information (including pricing) read the FAQ or contact us by phone or email.
Phone: 800-631-1884 (North America)
Phone: 614-447-3870
E-mail: answers@cas.org
For a simple exact match of a chemical name or CAS Registry Number® ask about the basic Registry Lookup Service.