General - Quality Requirements of Hydraulic Fluids

The quality of a hydraulic fluid is an indication of the length of time that the fluids essential properties will continue to perform as expected, i.e., the fluids resistance to change with time. The primary properties affecting quality are oxidation stability, rust prevention, foam resistance, water separation, and antiwear properties. Many of these properties are achieved through use of chemical additives. However, these additives can enhance one property while adversely affecting another. The selection and compatibility of additives is very important to minimize adverse chemical reactions that may destroy essential properties.

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