WATER IN OIL
The functionality of lubricants usually depends not on the water content, but on the water absorption capacity and thus on the degree of saturation. However, the
determination of the water content is widespread from the historical point of view and has a fundamental reference with the Karl Fischer titration.
Traces of water are contained in each oil. Even fresh oils are not absolutely water-free but contain water between 15 ppm (insulating oils) and 400 ppm (motor oils).
Water is a very common contamination in oils and fats. It affects lubricant film formation of lubricants and is a cause of corrosion of machines and systems.