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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.
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.