The Chemical Abstracts Service (CAS) Registry Number (or CASRN) is a globally recognized unique identifier assigned to chemical substances and molecular structures. These identifiers are generated by the CAS, a division of the American Chemical Society, and are guaranteed to be unique to a particular compound. While CAS numbers have no intrinsic chemical or scientific meaning, they serve as an essential tool for accurately identifying substances.
Role in Sustainable Supply Chain Management
The CAS registry, updated daily, is widely regarded as an authoritative standard for chemical identification. In an industry where substances can have multiple proprietary names, generic labels, or complex scientific descriptions, CAS numbers provide a reliable common denominator for stakeholders worldwide.
When combined with other tools — such as blockchain technology or DNA-based traceability — CAS numbers enable comprehensive tracking and management of chemical substances throughout their life cycles. This facilitates clear communication among stakeholders and ensures compliance with legal requirements in supply chains.
The Importance of CAS Numbers in the EU REACH Regulation
Within the European Union’s REACH regulation (Registration, Evaluation, Authorization, and Restriction of Chemicals), CAS numbers play a critical role in identifying substances for registration in supply chains. While other identifiers, such as the IUPAC name (scientific name), EINECS number (European Inventory of Existing Commercial Chemical Substances), or ELINCS number (European List of Notified Chemical Substances), can also be used, CAS numbers are globally recognized and widely adopted.
The REACH registration process generates additional numerical identifiers, such as the "list number" assigned upon notification to the Classification and Labelling (C&L) Inventory. However, these identifiers may lack the legal status or international recognition of CAS numbers. For this reason, using CAS numbers alongside REACH-specific identifiers is highly recommended to ensure seamless communication and compliance throughout global supply chains.