EXPLANATION
Oxidation induction time can be used as an indication of oxidation stability. No correlation has been determined between the results of this test and service performance. This test method covers lubricating greases subjected to oxygen at 3.5 MPa (500 psig) and temperatures between 155 and 210° C.
TEST SUMMARY
A small quantity of grease in a sample pan is 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. A kinetic equation incorporated with this test method can estimate oxidation induction times at other temperatures.
TEST PRECISION
Where M is the mean of the two results.
This procedure has no bias.