OXIDATION INDUCTION TIME OF LUBE OILS BY PRESSURE DIFFERENTIAL SCANNING CALORIMETRY (PDSC): ASTM D6186
EXPLANATION
Oxidation induction time as determined under the conditions of this test method, may be used as an indication of oxidation stability. This test method covers the determination of oxidation induction time of lubricating oils subjected to oxygen at 3.5 MPa and temperature between 130 and 210° C. This test method is faster than other oil oxidation tests, and requires a very small amount of sample. No correlation has been established between the results of this test method and service performance.
TEST SUMMARY
A small quantity of oil 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 lubricating oil at the specified test temperature.
TEST PRECISION
Repeatability: 0.17 m
Reproducibility: 0.35 m
Where m is the average of two test results.
The procedure in this test method has no bias because the value of oxidation induction time can be defined only in terms of this test method.
