CAS Registry Number

A CAS Registry Number is a unique numerical identifier assigned to every chemical substance by the Chemical Abstracts Service (CAS). It helps scientists, researchers, and industry professionals easily find and reference specific chemicals in literature, databases, and regulations. Each number is typically made up of up to ten digits, divided into three parts, and is used internationally. This system simplifies communication and ensures clarity, as many substances can have complex names or synonyms. Essentially, the CAS number serves as a reliable shorthand for identifying chemicals accurately.