ASTM D2893 for oxidation characteristics of extreme-pressure lubrication oils
1. Scope
1.1 These test methods (A and B) cover the determination of the oxidation characteristics of extreme-pressure fluid lubricants, gear oils, or mineral oils.
NOTE 1 - The changes in the lubricant resulting from these test methods are not always necessarily associated with oxidation of the lubricant. Some changes may be due to thermal degradation.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D91 Test Method for Precipitation Number of Lubricating Oils
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity)
D943 Test Method for Oxidation Characteristics of Inhibited Mineral Oils
E1 Specification for ASTM Liquid-in-Glass Thermometers
3. Summary of Test Method
3.1 The oil sample is subjected to a temperature of 95°C (Test Method A) or 121°C (Test Method B) in the presence of dry air for 312 h.
3.2 The oil is then tested for precipitation number and increase in kinematic viscosity.
4. Significance and Use
4.1 These test methods have been widely used to measure the oxidation stability of extreme pressure lubricating fluids, gear oils, and mineral oils.
