ASTM D5972 Freezing Point of Aviation Fuels (Automatic Phase Transition Method)
1. Scope
1.1 This test method covers the determination of the temperature below which solid hydrocarbon crystals form in aviation turbine fuels.
1.2 This test method is designed to cover the temperature range of -80 to 20°C; however, the ASTM interlaboratory study mentioned in 12.4 has only demonstrated the test method with fuels having freezing points in the range of -45 to -65°C.
1.3 The user shall exercise appropriate caution when this test method is used in testing Jet B and JP 4 samples (see 12.3).
1.4 The values stated in SI units are to be regarded as the standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements see 7.1, 7.3, and 7.5.
2. Referenced Documents
2.1 ASTM Standards:
D2386 Test Method for Freezing Point of Aviation Fuels
3. Terminology
3.1 Definitions:
3.2 freezing point, n - in aviation fuels, the fuel temperature at which solid hydrocarbon crystals, formed on cooling, disappear when the temperature of the fuel is allowed to rise.
3.3 Definitions of Terms Specific to This Standard:
3.3.1 automatic phase transition method, n - in this test method, the procedures of automatically cooling a liquid aviation fuel specimen until solid hydrocarbon crystals appear, followed by controlled warming and recording of the temperature at which the solid hydrocarbon crystals completely redissolve into the liquid phase.
3.3.2 Peltier device, n - a solid-state thermoelectric device constructed with dissimilar semiconductor materials, configured in such a way that it will transfer heat to and away from a test specimen dependent on the direction of electric current applied to the device.
