Chemical Abstracts Service Registry Number
Chemical Abstracts Service Registry Number : A unique identifier that tells you, for example, that acetone and dimethyl ketone are actually the same substance. From a safety and inventory perspective, this is a terrific idea. As of September 2009, there were 53,000,000 unique substances indexed by CAS. See: Http: //www.cas.org/aboutcas/faq.html for more info. The Chemical Abstracts Service, http: //www.cas.org/, is a division of the American Chemical Society, http: //www.acs.org/. MSDS Relevance: Filing chemicals by CAS number is one way to avoid the problem of finding an MSDS by name ("did I file that under dichloromethane or methylene chloride??"). Even if you have a computerized system you should include a field for CAS number because chemical names are often misspelled by non-chemists and spelling checkers do not handle technical terms very well. For more on chemical naming, See: The IUPAC entry. Remember: CAS numbers uniquely identify a chemical, but not necessarily the manufacturer or concentration. Other identifying systems are discussed in their own MSDS FAQ entry. See also: DOT, EINECS Number, NSN and NIIN's, UN/NA Numbers
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