Laboratory Reference Compounds

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A CAS Registry Number (CASRN) is a unique, official numerical identifier assigned by the Chemical Abstracts Service (a division of the American Chemical Society) to every specific chemical substance.

Why We Use CAS Numbers:

• Stops Confusion: Chemicals have multiple trade and common names. A CAS number points to only one unique substance.
• Universal Standard: Functions identically across all countries and languages without translation barriers.
• Easy Searching: Scientists and regulatory bodies use CAS numbers to rapidly locate safety data sheets (SDS) and analytical records.

Structure & Example:

Contains up to 10 digits separated by hyphens into 3 parts. Example: Water is 7732-18-5. The final single digit acts as a mathematical check digit.