ASTM D1094 standard test method for water reaction of aviation fuels
4. Summary of Test Method
4.1 A sample of the fuel is shaken, using a standardized technique, at room temperature with a phosphate buffer solution in scrupulously cleaned glassware. The cleanliness of the glass cylinder is tested. The change in volume of the aqueous layer and the appearance of the interface are taken as the water reaction of the fuel.
5. Significance and Use
5.1 When applied to aviation gasoline, water reaction volume change using the technique reveals the presence of water-soluble components such as alcohols. When applied to aviation turbine fuels, water reaction interface rating using the technique reveals the presence of relatively large quantities of partially soluble contaminants such as surfactants. Contaminants that affect the interface are apt to disarm filter-separators quickly and allow free water and particulates to pass. Other tests, such as Test Methods D3948, are capable of detecting surfactants in aviation fuels.
