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Stability of Hydraulic Fluid: The
stability of a hydraulic fluid is the most important
property affecting service life. The properties of a
hydraulic fluid can be expected to change with time. Factors
that influence the changes include: mechanical stress and
cavitation, which can break down the viscosity improvers and
cause reduced viscosity; and oxidation and hydrolysis which
cause chemical changes, formation of volatile
components, insoluble materials, and corrosive
products. The types of additives used in a fluid must be
selected carefully to reduce the potential damage due to
chemical breakdown at high temperatures.
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