Hydraulic Fluid

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hydraulic fluid

[hī′drȯ·lik ′flü·əd]
A low-viscosity fluid used in operating a hydraulic mechanism.

Hydraulic Fluid


a fluid used in machines and mechanisms to transmit forces. Hydraulic fluids should have a high resistance to oxidation, low frothing, inertness with respect to materials in the components of hydraulic systems, a flat viscosity curve, a low freezing point, and a high flash point. The petrochemical industry produces over 20 kinds of oils that are used in hydraulic systems (see Table 1).

Certain industrial and motor oils are utilized in a number of cases as hydraulic fluids. The majority of hydraulic fluids contain antioxidants, antifoamants, and other additives.


Nefteprodukty: Spravochnik. Edited by B. V. Losikov. Moscow, 1966.
Motornye i reaktivnye masla i zhidkosti, 4th ed. Edited by K. K. Papok and E. G. Semenido. [Moscow, 1964.]


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