Client Services

CAS Client Services is a fee-based service that offers you several options for confirming and assigning CAS Registry Numbers® (often referred to as CAS RNs or CAS Numbers) and obtaining CA Index Names.


Inventory Expert Service

To obtain CA Index Names and assign CAS Registry Numbers for regulatory chemicals to be included on Premanufacture Notification (PMN) submissions to the U.S. EPA.


Chemist Consultation - Substance Identification

For substance information identification via CAS Registry Number assignment and CA Index Name generation


Registry Lookup Service

For confirmation of chemical names or assignment of existing CAS Registry Numbers


Computer Readable Services

For identifying large numbers of chemical substances including assignment of existing CAS Registry Numbers and retrieval of CA Index Names and CAS synonyms


Contact CAS Client Services

For more information and instructions, including prices, contact CAS Client Services in any of the following ways:

Phone: 800-631-1884 (North America)
Phone: 614-447-3870
Fax: 614-447-3747
E-mail: answers@cas.org
CAS Client Services vCard 

Contact CAS Client Services

E-mail   Phone & Fax
answers@cas.org   800-631-1884 (North America)
    614-447-3870 (Worldwide)
    614-447-3747 (Fax)