Prist Anti Icing Aviation Fuel Additive PHF204Univar Prist Hi Flash Hi Flo anti icing aviation fuel additive is clear in color and depresses the freezing point of water in aircraft fuel. It has a boiling point of 193 to 194 degrees C and a flash point of 83. 9 to 91 degrees C. The product has a specific gravity of 1. 023 at 20 degrees C and a vapor pressure of 0. 19 to 0. 25 millimeters Hg at 20 to 25 degrees C. This fuel additive in mild aromatic odor, has an auto ignition temperature of 215