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This group of products includes air compressor oil, vacuum pump, refrigeration oil and gas (referring to gases other than air and refrigerant) compressor oil. The basis for the division of each variety is as follows: (1) Air compressor oil is based on the type of air compressor, load (exhaust pressure, exhaust gas pressure, silver pressure ratio, etc.) and oil composition. (2) Vacuum pump oil according to the type of pump, vacuum condition and presence or absence of corrosive gases. (3) Refrigeration oil depends on the operating temperature of the evaporator, the type of refrigerant and freezer, and the composition of the oil.