Nomenclature and registration
Get complete and reliable substance data
Request a new CAS Registry Number or match your existing chemical name or CAS Registry Numbers to other needed substance data.
CAS Registry Services℠
CAS REGISTRY® and CAS Registry Numbers® are universal standards for definitive identification of chemical substances and relied upon worldwide by scientists and manufacturers needing authoritative information.
Contact usInventory expert service
Ensure accuracy of regulatory submissions
Meet requirements for PMN applications by requesting CA Index Names and CAS Registry Numbers from the experts.
Licensing CAS REGISTRY Data
Reliable substance data to fuel your solutions
License data from CAS REGISTRY, including CAS RNs, to improve digital R&D workflows and ensure compliance for public use.
Features
The definitive source for accurate and comprehensive substance information
275 million unique chemical substances, and growing
Organic, inorganic, and coordination compounds
Alloys, minerals, and polymers
Protein and nucleic acid sequences
Curated by scientists
