What does 56-81-5 stand for?
The CAS Number 56-81-5 stands for glycerine (also glycerin or glycerol), an organic chemical compound in the family of alcohols. This sugar alcohol is a propane triol.
The exact chemical name is Propane-1,2,3-triol.
Advantages of the CAS Numbers
As molecular formulas, trivial names and IUPAC names of chemical substances are not unambiguous, they lead to mistakes, made particularly by nonchemists. A CAS number, however, refers to exactly one chemical substance, e.g. 56-81-5 refers solely to pure glycerine.
Alloys, biosequences and polymers but also various isomers of a molecule can be reliably distinguished with the CAS number, irrespective of other names.