Chlorodifluoromethane R-22 is a colorless, almost odorless gas at room temperature, non-flammable, non-explosive, non-corrosive, slightly more toxic than R12, but still, a safe refrigerant, classified as A1 and can be liquefied under pressure as no transparent liquid. The chemical stability and thermal stability of chlorodifluoromethane R-22 are very high, especially in the absence of moisture, it does not react with general metals below 200 °C. Only works slowly with bases in the presence of water. But cracking occurs at high temperatures. R22 is a low-temperature refrigerant, which can obtain a refrigeration temperature of -80°C.

　　The main use of chlorodifluoromethane R-22

　　As the most widely used medium and low-temperature refrigerant today, R22 is mainly used in household air conditioners, commercial air conditioners, central air conditioners, mobile air conditioners, heat pump water heaters, dehumidifiers, refrigerated dryers, cold storage, food refrigeration equipment, marine refrigeration equipment, and industrial refrigeration. , commercial refrigeration, refrigeration condensing units, supermarket display cabinets, and other refrigeration equipment. Difluoromonochloromethane can also be used as a raw material for the production of polytetrafluoroethylene resin and an intermediate for fire extinguishing agent 1121, and as a physical foaming agent for polymers (plastics). It is used in reciprocating compressors as a refrigerant for industrial, commercial, and household air-conditioning systems; it can also be used as an aerosol propellant for insecticides and paint spraying, and can also be used to produce fire extinguishing agent 1211; it is used to produce various fluorine-containing polymers. Basic raw materials for compounds.

　　R22 is an HCFC refrigerant, which will be completely phased out by 2030 according to the Montreal Protocol.

　　Main environmentally friendly alternatives: R404A, R410A, R290, R23, R407C, R411A, R417A, R1270.

　　It is generally used in air conditioners or the first stage of double-machine stacking.