Hydraulic system of the hydraulic oil basic requirements:

1. Suitable viscosity, good viscosity-temperature characteristics, general hydraulic oil viscosity is usually in the 15 ~ 68 was between/s.

2. Quality of a material is pure, little impurity, have good lubrication performance.

3. To metal and seals have good compatibility, resistance of foam, fight emulsion, anticorrosion, rust the gender is good.

4. On the heat, oxidation, hydrolysis and shear have good stability.

5. Volume low expansion coefficient, specific heat let big.

6. The hydraulic oil flow point and low freezing point, flash point and high flash point.

7. No harm to human body, the cost is low.