ASTM D2532 Test Method for Viscosity and Viscosity Change After Standing at Low Temperature of Aircraft Turbine Lubricants
3. Summary of Test Method
3.1 Kinematic viscosity is measured at low temperature in accordance with Test Method D 445 and at time intervals of 3 h and 72 h.
NOTE 1 - This test method was developed and the precision established on tests at -53.9°C (-65°F). It is also applied at -40°C (-40°F) and may be used at other temperatures. Viscosities may be measured and reported at other intervals as agreed by the contracting parties.
4. Significance and Use
4.1 Aircraft turbine lubricants, upon standing at low temperatures for prolonged periods of time, may show an increase in kinematic viscosity. This increase may cause lubrication problems in aircraft engines. Thus, this test method is used to ensure that the kinematic viscosity does not exceed the maximum kinematic viscosity in certain specifications for aircraft turbine lubricants.
