Noack Volatility

ASTM D5800 - Standard Test Method for Evaporation Loss of Lubricating Oils by the NOACK Method

 

The evaporation loss is of particular importance in engine lubrication. Where high temperatures occur, portions of an oil can evaporate. Evaporation may contribute to oil consumption in an engine and can lead to a change in the properties of an oil. Oils failing to meet the volatility limits will struggle in many oxidation tests including the sequence IIIG engine test which is a critical and sometimes formulation defining test.  This test is impacted by many factors including the Noack volatility.  Anti-oxidants can improve oxidation control but cannot prevent evaporation of the base stock leading to rapid oil thickening.

 

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