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Zinc & Ash Free (ZAF) hydraulic oils have become more important in modern times as more manufacturers are recommending a ZAF oil as to not contaminate metalwork such as silver plating that can be found on bearings and in some pump assemblies, not only metals, Zinc and Ashes can react and damage plastic areas of the operating system causing failure. Another advantage of ZAF is that there is less risk of sticky deposits being produced with water contamination (e.g. in machine tools using water soluble coolants), Zinc additives can react with water causing deposits that blind filters and cause valve stick.
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