What is the main difference between Ethylene Glycol and Propylene Glycol?
Ethylene Glycol : Many of the current uses for ethylene glycol are due to its properties as a freezing point depressant. However, this compound is also valuable in numerous applications which depend upon one or more additional properties. Its solvent, lubricant, plasticizing, and hygroscopic properties, as well as the ease with which it reacts with other chemical intermediates, is the reason for its popularity as an industrial raw material. Propylene Glycol : The low toxicity of propylene glycol, which is unique among the glycols, means that ingestion of the product need not cause severe illness or death. Because of this, there are different grades intended for different levels of contact with the human body. In common with the other glycols, propylene glycol is colourless and odorless, and has a wide range of solvency for organic materials, as well as being completely water soluble. In Summery : Ethylene Glycol is the more toxic of the two glycols, thus Propylene Glycol should be used
