G L Y C O L S
Propylene Glycol (MPG)
By emulsifying the active ingredients, which otherwise would not mix, the propylene glycol creates a stable homogeneous fluid that will allow the intended final product, be it a face cream or shampoo, for example, to do its job.
Because of its mutual solvent properties, both aromatic chemicals and essential oils can be dissolved in propylene glycol and then diluted with water. Propylene glycol is used to extract flavor from natural flavoring materials. In soft drinks, it is employed as a syrup flavor solvent and imparts smoothness, body and sparkle to the final product.
Propylene glycol can be used to lubricate food packaging machinery; ordinary lubricants are prohibited because of their toxic effects. Some types of food products, such as dates, can be prevented from sticking to process machinery by washing them with solutions of propylene glycol.