---
title: "CAS Registry Number: research glossary | Sable Peptides"
description: "A CAS Registry Number is a unique numerical identifier assigned by the Chemical Abstracts Service to every chemical substance described in the literature."
canonical: https://www.sablepeptides.co.uk/glossary/cas-registry-number
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# CAS Registry Number

A CAS Registry Number is a unique numerical identifier assigned by the Chemical Abstracts Service to every chemical substance described in the literature. It takes the form of up to ten digits separated by hyphens. Researchers use CAS numbers to identify compounds unambiguously across databases, catalogues and safety documents.

Source: [en.wikipedia.org](https://en.wikipedia.org/wiki/CAS_Registry_Number)

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