Propylene glycol and glycerine often appear the same because they are colorless, odorless, sweet, and they have syrup-like consistency. Although they share certain physical properties, they have very distinctive features and it is very important to define these compounds precisely.
Glycols and glycerines are two types of substances that have a variety of uses. Glycerine is more viscous than glycol, which means it has a higher boiling point. Glycerines are generally used as additives to food or as skin moisturizers, while ethylene glycols are used as heat transfer fluids or propylene glycol is a common ingredient in cosmetics. Moreover, ethylene glycol dinitrate may work as anti-freezer in the production of dynamite.