ASTM D5483 Test Method for Oxidation Induction Time of Lubricating Greases
ASTM D5483 Standard Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
4. Summary of Test Method
4.1 A small quantity of grease is weighed into a sample pan and placed in a test cell. The cell is heated to a specified temperature and then pressurized with oxygen. The cell is held at a regulated temperature and pressure until an exothermic reaction occurs. The extrapolated onset time is measured and reported as the oxidation induction time for the grease under the specified test temperature.
4.2 A kinetic equation incorporated with this test method can estimate oxidation induction times at other temperatures.
5. Significance and Use
5.1 Oxidation induction time, as determined under the conditions of this test method, can be used as an indication of oxidation stability. This test method can be used for research and development, quality control and specification purposes. However, no correlation has been determined between the results of this test method and service performance.
