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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 Registry Number is a numeric identifier that can contain up to 10 digits, divided by hyphens into three parts. The right-most digit is a check digit used to verify the validity and uniqueness of the entire number.For example, 58-08-2 is the CAS Registry Number for caffeine.ach CAS Registry Number (often referred to as a CAS Number): 1  Is a unique numeric identifier. 2  Designates only one substance. 3  Has no chemical significance. 4  Is a link to a wealth of information about a specific chemical substance.