Nomenclature and Registration Services

Partner with CAS to get accurate and reliable chemical substance information, including CAS Registry Numbers, CA Index Names, and other substance data.

Partner with CAS to get accurate and reliable chemical substance information, including CAS Registry Numbers, CA Index Names, and other substance data.

Request CAS Registry Lookup

For exact matches of a substance with a CA Index Name or CAS Registry Number®, complete and submit the CAS Registry Lookup Service Order Form. Turnaround is 24 hours, excluding weekends and holidays, and the pricing is $48 per item searched.

Request Expert Consultation

  1. To avoid delays, review the CAS Registration Criteria Overview and Registry Number Info Requirements before submitting your request.
  2. Submit the Chemist Consultation - Substance Identification Order Form and relevant chemical structure diagram/descriptive information to expedite processing. 

    Note: A unique substance identifier is requested for each substance to facilitate matching the results to your input information. These identifiers can include internal substance IDs, such as tradename, product code, or sequential numbering. 

  3. After submitting required information to CAS, our team of experienced chemists will evaluate your submission and provide you with the following substance information:
  • CAS Registry Numbers (new or existing)
  • CA Index Names (new or existing)
  • Substance definitions

Additional information can be found in our FAQ.

For exact matches of a substance with a CA Index Name or CAS Registry Number®, complete and submit the CAS Registry Lookup Service Order Form. Turnaround is 24 hours, excluding weekends and holidays, and the pricing is $48 per item searched.

Request Expert Consultation

  1. To avoid delays, review the CAS Registration Criteria Overview and Registry Number Info Requirements before submitting your request.
  2. Submit the Chemist Consultation - Substance Identification Order Form and relevant chemical structure diagram/descriptive information to expedite processing. 

    Note: A unique substance identifier is requested for each substance to facilitate matching the results to your input information. These identifiers can include internal substance IDs, such as tradename, product code, or sequential numbering. 

  3. After submitting required information to CAS, our team of experienced chemists will evaluate your submission and provide you with the following substance information:
  • CAS Registry Numbers (new or existing)
  • CA Index Names (new or existing)
  • Substance definitions

Additional information can be found in our FAQ.

Design Element 2

Contact

CAS service professionals are available to answer questions and help you with requests.

+1 800.631.1884 (North America) 

+1 614.447.3870 (Outside North America)

answers@cas.org 

CAS service professionals are available to answer questions and help you with requests.

+1 800.631.1884 (North America) 

+1 614.447.3870 (Outside North America)

answers@cas.org