How to classify hydraulic oil? What are the specifications?

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How to classify hydraulic oil? What are the specifications?
Time: 2014-01-20 Source: http://

1) There are seven types of mineral oil: L-HH oil, also known as mechanical oil; L-HL oil is general-purpose machine tool hydraulic oil; L-HR oil; L-HM precision machine tool guide oil; L-HG oil, ie hydraulic guide Oil or precision machine tool guide oil; L-HV oil, also known as low temperature or low condensation hydraulic oil, engineering hydraulic oil, high viscosity index oil, thickened hydraulic oil; L-HS oil, that is, synthetic low temperature hydraulic oil.
2) There are 5 types of flame retardant hydraulic oil: L-HFA hydraulic oil (oil-in-water emulsion, high water-based hydraulic fluid), L-HFB hydraulic fluid (water-in-oil emulsion), L-HFC hydraulic fluid (water-ethylene) Alcohol flame retardant), L-HFDR hydraulic fluid (phosphorus phosphate flame retardant), L-HEES hydraulic fluid (synthetic ester flame retardant)
3) Special hydraulic oil: aviation hydraulic oil, aviation flame retardant hydraulic oil and hydraulic oil for ships and guns.
In metallurgical production, due to the large pressure and flow rate of most hydraulic systems and high control precision, the performance of hydraulic oil has high requirements. L-HM anti-wear hydraulic oil is the most used, and the hard-to-burn liquid is mainly L-HFC water. - Ethylene glycol hydraulic fluid.

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