What is the difference between ethylene glycol and propylene glycol?
ETHYLENE GLYCOL Many of the present uses for ethylene glycol are based on its properties as a freezing point depressant, but this compound is also valuable in numerous applications which depend upon one or more additional properties. The ease with which it reacts with other chemical intermediates plus its solvent, lubricant, plasticizing, and hygroscopic properties-all are likewise responsible for its popularity as an industrial raw material. PROPYLENE GLYCOL Propylene glycol is unique among the glycols in that its very low toxicity permits it to be taken internally. Because of this fact there are grades intended for industrial use and those intended for applications that may involve absorption into the human body. In common with the other glycols, propylene glycol is odorless and colorless and has a wide range of solvency for organic materials, plus being completely water soluble.
