Propylene Glycol for Glycol ChillersDouglas Thermal Fluids inhibited propylene glycol Heat Transfer Fluids (HTF) provide years of reliable corrosion protection in demanding applications, such as fermentation cooling, immersion freezing, HVAC, food, and pharmaceutical applications, where propylene glycol solutions are preferred or required. Compliant with the United States Department of Agriculture (USDA) and Food and Drug Administration (FDA) regulations, it is ideal for applications