(2) The viscosity should be moderate, too large will affect the convection heat dissipation, and too small will reduce the flash point.


(3) The flash point should be as high as possible and generally not lower than 135 ° C.


(4) The freezing point should be as low as possible.


(5) The lower the content of impurities such as acids, alkalis, sulfur, ash, etc., the better, in order to avoid their corrosion on insulation materials, wires, fuel tanks, etc. as far as possible.


(6) The degree of oxidation cannot be too high. The degree of oxidation is usually expressed in terms of acid value, which refers to the amount of potassium hydroxide (mg) required to absorb 1 g of free acid in the oil.


(7) The degree of stability should not be too low. The degree of stability is usually expressed by the precipitate of the acid value test, which represents the ability of the oil to resist aging.


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