Application RapidOxy: Stability of Lubricating Greases

The stability of lubricating greases with different thickener types was tested at 160 °C in the RapidOxy and according to the ASTM D942.

Alternative to Traditional Stability Test Methods

The rapid small scale tester, RapidOxy, 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 procedure requires only a small sample to give exact test results in a short period of time.

Quick Preparation and Easy Handling

All it takes on preparation is to fill 4 g of sample into the glass sample dish, place the sample dish in the test chamber, tighten the screw cap and close the instrument. The test chamber is automatically charged with oxygen pressure and heated until it reaches the test temperature of 160 °C. Now the pressure is monitored until a pressure drop of 10 % from pmax is detected.

Fig. 1: Display of test progress

Comparing Test Results of RapidOxy and ASTM D942

Nine grease samples, containing different types of thickener, have been tested in a RapidOxy at 160 °C and according to the ASTM D942 (100 °C, 100 h and 400 h).

Tests have shown that the RapidOxy results have good repeatability and show good correlation to the ASTM D942 results at 100 °C after 100 h and 400 h test time.

Do you have any questions?

Contact Anton Paar ProveTec directly: support.provetec[at]

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