- Method ASTM D2386
- Repeatability 0.8° C
- Reproducibility 2.3° C
- Blending non-linear
- Additive Correction No
The purpose of this test is to determine the temperature below which solid hydrocarbon crystals may form in aviation turbine fuels and aviation gasoline.
Freeze point one of the most important methods in the testing of jet fuel products. As a plane climbs up to altitude the temperatures of the fuel tank and lines can drop. Think about a mountain, it may be green at the bottom but is almost always covered in snow at the top. If the temperature of the tanks and lines drop below the freezing point of the fuel it will impeded the fuel flow and block the filter. This will cause the engine to starve and shut down.
The method is performed by cooling a dried sample of jet fuel while mixing it with a stirring coil in a test tube. When crystals first appear the sample is removed from the cooling bath while continuing to stir. Once the crystals disappear this temperature is recorded and reported.