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Tetrachloroethylene - CAS # 127-18-4. Information provided on Tetrachloroethylene (127-18-4) is for reference only and is subject to change. There is no warranty of accuracy or completeness of any information contained herein.
There has been an exponential growth in the number of substances indexed by CAS, with the number doubling between 2009 and 2015 as shown in this graph: Key point: CAS numbers identify the chemical, but not its concentration or specific mixture. For example, hydrogen chloride (HCl) has the CAS number 7647-01-0. That CAS number will appear on containers of anhydrous hydrogen chloride, a 20% solution of HCl in water, and a 2.0 molar solution of HCl in diethyl ether. The numbers you see on trucks on the highway are not CAS Numbers, but U.S. Department of Transportation (DOT) mandated UN/NA codes which are not necessarily specific to each chemical.