| Hydraulic Oil Properties |
| Function |
Property |
| Medium for power transfer and control |
- Low compressibility (high bulk modulus)
- Fast air release
- Low foaming tendency
- Low volatility
|
| Medium for heat transfer |
- Good thermal capacity and conductivity
|
| Sealing Medium |
- Adequate viscosity and viscosity index
- Shear stability
|
| Lubricant |
- Viscosity for film maintenance
- Low temperature fluidity
- Thermal and oxidative stability
- Hydrolytic stability / water tolerance
- Cleanliness and filterability
- Demulsibility
- Antiwear characteristics
- Corrosion control
|
| Pump efficiency |
- Proper viscosity to minimize internal leakage
- High viscosity index
|
| Special function |
- Fire resistance
- Friction modifications
- Radiation resistance
|
| Environmental impact |
- Low toxicity when new or decomposed
- Biodegradability
|
| Functioning life |
|
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|
