Aviation
Aviation Hydraulic Fluid
Hydraulic Fluid 7-50S-3
Polysiloxane-ester aviation hydraulic fluid for aircraft hydraulic systems, serving from -60 °C to +175 °C at up to 21 MPa.
High-performance gas-turbine lubricant · -50 °C to +200 °C
A high-performance aircraft-type gas-turbine lubricant formulated from a polyalphaolefin combined with a high-thermal-stability synthetic ester base oil and a unique additive package. It exhibits much-improved anti-wear performance, low evaporation rate, high lubricating properties, high thermo-oxidative stability and excellent resistance to foaming.
Best used in heat-stressed gas-turbine military and civil aircraft engines with outlet oil temperatures up to 200 °C. Also suitable for aircraft cooling turbines as a main oil brand and other assemblies, particularly aircraft-engine-powered gas-compressing plants. Effective operating range -50 °C to +200 °C.
| Property | Typical |
|---|---|
| Appearance | Light yellow clear oil |
| Density at 20 °C, kg/dm³ | 843 |
| Viscosity at 100 °C, cSt | 3.8 |
| Viscosity at -40 °C, cSt | 3000 |
| Flash point, COC, °C | 216 |
| Pour point, °C | -56 |
| Acid number, mg KOH/g | 0.025 |
| Lubricity at 20±5 (Pk), kgf | >71 |
| Mechanical impurities, % | None |
| Thermo-oxidative stability, 200 °C / 50 h (GOST 23797-79) — limits | |
| Deposit insoluble in isooctane, %, max | 0.1 |
| Acid number after oxidation, mg KOH/g, max | 8.0 |
| Viscosity after oxidation at 100 °C, mm²/s, max | 5.0 |
| Viscosity after oxidation at -40 °C, mm²/s, max | 5000 |
| Corrosion (steel ShKh-15, Al alloy AK-4, Cu M-1/M-2) | None |
Typical values shown do not constitute a specification. The information is based on current knowledge and is intended to describe the product for possible applications; it does not release the user from performing preliminary tests.
Polysiloxane-ester aviation hydraulic fluid for aircraft hydraulic systems, serving from -60 °C to +175 °C at up to 21 MPa.