CAS REGISTRY®, the CAS substance collection, is the premier source relied upon by scientists and regulators worldwide for accurate information on chemical substances.

CAS (Chemical Abstracts Service) is a division of the American Chemical Society. It is a source of chemical information and is located in Columbus, Ohio, United States.

“CAS registry” is a registered trademark of the American Chemical society.

With 24 academic units and multiple research centers, this is the place where groundbreaking research and curiosity collide. CAS provides a powerful educational experience that …

CAS numbers are unique numbers assigned to chemical substances by the Chemical Abstract Service to provide a consistent and reliable way of identifying the chemical substances.

Dec 16, 2025 · You can also identify your substance of interest by its CAS Registry Number®, which is universally used to provide a unique, unmistakable identifier for chemical substances.

Chemical Abstracts Service (CAS), a division of the American Chemical Society, assigns these identifiers to every chemical that has been described in the literature.

CAS provides solutions and services that help empower scientific discoveries. Learn how CAS can facilitate your research and drive innovation.

CAS Registry Numbers (CAS RN) are simple and regular, convenient for database searches. They offer a reliable, common and international link to every specific substance across the …

Dec 22, 2025 · The CAS reference collection aggregates and connects scientific knowledge from thousands of journals and other sources published globally in more than 50 languages dating …