CAS REGISTRY and CAS Registry Number FAQs | CAS
www.cas.org › support › documentationA CAS Registry Number is a numeric identifier that can contain up to 10 digits, divided by hyphens into three parts. The right-most digit is a check digit used to verify the validity and uniqueness of the entire number. For example, 58-08-2 is the CAS Registry Number for caffeine. How does CAS assign Registry Numbers? A CAS Registry Number is assigned to a substance when it enters the CAS REGISTRY database.
CAS REGISTRY | CAS
www.cas.org › cas-data › cas-registryA CAS Registry Number is a unique and unambiguous identifier for a specific substance that allows clear communication and, with the help of CAS scientists, links together all available data and research about that substance.