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The CAS Registry Number is similar to a telephone number and has no significance in terms of the chemical nature or hazards of the material. The CAS Registry Number can be used to locate additional information on the material, for example, when searching in books or chemical data bases.
A CAS Number is a short string of text that refers to a chemical substance. CAS Numbers contain a sequence of up to ten numerical digits separated into three groups by two hyphens. Example CAS Numbers.