Antioxidants Found In Turbine Oils
Each turbine oil has a unique formulation with regards to antioxidants, both in the type of antioxidants that are present and the amounts. Some turbine oils have only phenolic antioxidants, some have only amine antioxidants, and some have both amines and phenols. In each case, the lubricant manufacturer has tried to develop a product in which the antioxidant package will work in harmony with their basestock.
When you are looking at a RULER graph, the X axis is in units of time (seconds). As the time increases during the running of the test, the voltage applied to the sample is also increasing. Different antioxidant molecular species will produce a reaction at different times (voltage levels). Amine antioxidants produce a reaction (a peak on the graph) in the 7 to 12 second range. Phenolic antioxidants produce a peak in the 12 to 17 second range. The y axis is related to the concentration of the antioxidant – the higher the peak the more antioxidant that is present.
