Method description:
A sample of the oil to be tested is mixed with water in a 40:40 (ml) ratio for 5 min. The result of the test is the time, given in minutes, at which the oil-water phase separation occurs until an emulsion of 3 ml or less is obtained. The maximum test time is 60 min.
Interpretation of results:
A deterioration in water separation properties can indicate a number of abnormalities such as mixing with another type of oil, ageing of the oil, contamination. This is a very contamination-sensitive parameter and should be assessed based on the properties of fresh oil. It is important to know that not all oils separate water; in oils where dispersant additives are used, e.g. HLPD-class hydraulic oils or engine oils, an emulsifying/dispersing effect is desirable.
The test result indicates whether the oil, in the presence of water, provides corrosion protection to steel components.
