Application Report RapidOxy 100: Oxidation Stability of Lubricating Greases

Anton Paar tested the oxidation stability of lubricating greases with different thickener types at 160 °C in the RapidOxy 100 and according to ASTM D942. Oxidation stability provides information about the oxidation resistance of materials such as lubricating greases when exposed to autoxidation.


This report describes the determination of the oxidation stability of eleven grease samples comparing results from the RapidOxy 100 at 160 °C with results using the method ASTM D942 at 99 °C after 100 h and 400 h oxidation time.

The rapid small scale oxidation tester, RapidOxy 100, is a fast, safe and user-friendly alternative to traditional stability test methods. The instrument measures the induction period, which can be used as an indication of the oxidation and storage stability. Compared to other oxidation and storage stability test methods, the RapidOxy 100 procedure requires only a small sample quantity to give exact test results in a short period of time.

The RapidOxy 100 artificially accelerates the oxidation process by using increased temperature and oxygen pressure. It is a rapid test method to determine oxidation stability without preliminary sample preparation.