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Demulsibility or water separation: Water
that enters a hydraulic system can emulsify and promote the
collection of dust, grit, and dirt, and this can adversely
affect the operation of valves, servos, and pumps, increase
wear and corrosion, promote fluid oxidation, deplete
additives, and plug filters. Highly refined mineral oils
permit water to separate or demulsify readily. However, some
additives such as antirust treatments actually promote
emulsion formation to prevent separated water from settling
and breaking through the antirust film.
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