Application RapidOxy: Stability of Neat Cutting Oils
Neat cutting oils are used in machining operations, e.g. grinding, turning, milling, broaching, drilling, tapping, gear cutting etc., to provide cooling and lubrication of the tools and a good surface finish of the components being machined.
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 the sample into the PTFE dish, 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 140 °C in the standard program. Now the pressure is monitored until a pressure drop of 10 % from pmax is detected.
Fig. 1: Display of test progress
The following table shows the oxidation stability of two neat oils with and without antioxidant.
|Results of Neat Oil Antioxidants Screening|
|Time until pressure drop of |
10 % below pmax
|Whole oil||Test 1||Test 2|
|Esther-based 20 cSt |
|Esther-based 40 cSt |
Antioxidants extend the oxidation stability of neat oils. Therefore, the results show that products with antioxidant have a longer induction period than samples without antioxidant.
With antioxidant the shelf life of sample 2 was extended by more than 30 %, of sample 1 even by more than 50 %.
Do you have any questions?
Contact Anton Paar ProveTec directly: support.provetec[at]anton-paar.com
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