ASTM E2009 Oxidation Onset Temperature of Hydrocarbons by Differential Scanning Calorimetry
Lubricating oils, compressor oils, turbine oils and other lubricants may degrade in the presence of atmospheric oxygen. Typically this process is accelerated at elevated temperatures and elevated oxygen pressures. Oils that are more resistant to oxygen (high oxidative stability) tend to have longer service lives than oils with low oxidative stability. This test determines the relative oxidative stability of oils. It has three options:
- Ambient pressure, oxygen atmosphere
- Elevated pressure (500psi), oxygen atmosphere
- Ambient pressure, air atmosphere
Option (B) is the most severe; option (C) is the least severe. Please specify the desired option when requesting this test.
The sample is placed in the DSC and heated at a controlled rate (10°C/min) until an exotherm (release of heat) is observed. Reported is the oxidation onset temperature.
Note: Petro-Lube offers several tests to determine the oxidative stability of oils. For the oxidation onset temperature, please consider this test (ASTM E2009), for the relative oxidation onset time under isothermal conditions, please consider ASTM D6186.