Oxidation stability—ASTM D2112: This test method is a rapid test for evaluating the oxidation stability of a new mineral insulating oil that contains the synthetic oxidation inhibitor 2-6 DBPC or 2-6 DBP. The test measures the length of time required for the oil sample to react with a given volume of oxygen when a sample of oil is heated and oxidized under test conditions.
Oxidation stability—ASTM D2440: This test method determines the resistance of mineral insulating oils to oxidation under prescribed accelerated aging conditions. Oxidation stability is measured by the propensity of oils to form sludge and acid products during oxidation. This test method is applicable to new oils, both inhibited and uninhibited.