Hydraulic Oil You May Cook With?

Hydraulic Oil You May Cook With?

Maybe you have driven through an undesirable puddle water only to have your miserable engine lock solid after ingesting a cylinder full? This is whats called hydraulic lock and is also a pricey instance of hydraulic power which hydraulic oils convey.

On this commentary I shall be centering on hydraulic fluids rather than brake fluids, that are an extremely specialized sub grouping.

Functions and properties

The crucial function of hydraulic oils would be to convey power. However ,, there are other significant functions of present hydraulic fluids.

The table below lists the main functions of hydraulic oil as well as the properties from the fluid that shape its capability to perform that function:

Hydraulic Performance properties

• Low compressibility (high bulk modulus)

• Quick air release

• Low foaming tendency

• Low volatility

Thermal performance

• Good thermal function and conductivity

Sealing properties

• Adequate viscosity and viscosity index

• Shear stability


• Satisfactory viscosity for film maintenance

• Cold fluidity

• Thermal and oxidative stability

• Hydrolytic stability / water tolerance

• Purity and filterability

• Demulsibility

• Wear reduction characteristics

• Corrosion control

Pump efficiency

• Appropriate viscosity to curtail internal leakage

• Superior viscosity index

Special requirements

• Fire resistance

• Friction modifiers

• Radiation resistance

Environmental impact properties

• Low toxicity when new or decomposed

• Biodegradability


Dating back to ancient Egypt the way of hydraulic fluid was water. It had been only from the 1920s that mineral oil grew to be used. This is because of oils inherent lubrication properties and performance at temperatures across the boiling point of water. Today most hydraulic fluids are based on mineral oil base stocks plus much more recently synthetic alternatives.

Current hydraulic oils can include a number of compounds, as well as: mineral oils, butanol, esters (e.g. phthalates, like DEHP, and adipates), polyalkylene glycols (PAG), phosphate esters (e.g. tributylphosphate), silicones, alkylated aromatic hydrocarbons, polyalphaolefins (PAO) (e.g. polyisobutenes), corrosion inhibitors, etc.

For environmentally hypersensitive applications, including farm tractors and marine dredging (where there will be the results of an oil spill from the ruptured oil line), biodegradable hydraulic oils based on rapeseed (Canola) vegetable oil works extremely well (often mixed with tailored synthetic esters). Typically these oils can be purchased as ISO 32, ISO 46, and ISO 68 specification oils

Other base stocks can be used for specialty applications, such as for fire resistance and extreme temperature applications. Some examples embrace: glycol, esters, organophosphate ester, polyalphaolefin, propylene glycol, and silicone oils (For Brake fluids).

Aircraft hydraulic systems

As aircraft performance improved, and so the force forced to activate mechanical flight controls increased, and hydraulic systems were shown ease pilot effort. Hydraulic power can also be employed to start the auxiliary power unit (APU) for self-starting the aircraft's main engines. While several aircraft equipped with the M61 family of cannon, exploit hydraulic power to drive the gun system, permitting reliable high rates of fire.

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