These deicing fluids can also be used to remove ice from automobile windshields. Hydraulic Fluids . Propylene glycol is formulated into all types of hydraulic and brake fluids, primarily to inhibit the swelling of rubber. In addition, it is a good solvent for corrosion inhibitors as well as other brake fluid components, and it functions over a wide range of temperatures. Food and Tobacco Products .
Propylene glycol is employed as a hygroscopic agent for tobacco.
It is used as a humectant in baked goods and shredded coconut to maintain freshness, and is added to cereals to improve friability and firmness. 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. Some types of food products, such as dates, can be prevented from sticking to process machinery by washing them with solutions of propylene glycol.