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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.
You can obtain the information you need for millions of substances from the most current and reliable collection of chemical substance information in the world, CAS REGISTRY. The CAS REGISTRY database contains records for specific substances identified by the Chemical Abstracts Service (CAS) REGISTRY system. All substance records contain a unique CAS Registry Number.