ASTM D3117 Test Method for Wax Appearance Point of Distillate Fuels
4. Summary of Test Method
4.1 A specimen of distillate fuel is cooled under prescribed conditions while being stirred. The temperature at which wax first appears is recorded as the wax appearance point.
5. Significance and Use
5.1 Wax appearance point is the temperature at which wax crystals begin to precipitate out of a fuel under specified cooling conditions. The presence of wax crystals in the fuel may restrict flow or plug the fuel filter. In critical fuel systems, wax appearance point may define the lower limit of acceptable operability.
