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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.
CAS Registry Overview at the CAS web site. Visit our MSDS Software or MSDS Suppliers pages for systems that include the CAS Number as a searchable category. The National Institute of Standards (NIST) Chemistry WebBook is searchable by CAS number, but has only thermodynamic and spectroscopic data rather than safety data.