WORKING FLUID FOR HYDRAULIC SYSTEMS IN AIRCRAFT ENGINEERING Russian patent published in 2006 - IPC C10M169/04 C10M171/02 C10M105/04 C10M133/12 C10M129/10 C10M137/04 C10M107/50 C10M129/42 C10N40/08 

FIELD: special-destination fluids.

SUBSTANCE: invention is dealing with hydraulic systems of aircrafts and helicopters operated within temperature ranges between 135°C and -60°C. Working fluid is made up of, wt %: phenyl-α-naphthylamine 0.2-0.4, 2,6-di-tert-butyl-p-cresol 0.3-0.5, tricresyl phosphate 0.4-1.0. polyethylsiloxane liquid with viscosity 44-49 mm²/s (20°C) 17-23, dioctyl sebacate 9.9-10.1, poly-α-olefins with viscosity 1.7-2.0 mm²/s (100°C) 25-32, poly-α-olefins with viscosity 3.7-4.3 mm²/s (100°C) to 100%.

EFFECT: improved viscosity characteristics at negative temperatures (to -60°C) and increased resistance to thermal oxidation.

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