Freon, also known as Freon, derives its name from English Freon, which is a refrigerant trademark registered by DuPont Company in the United States. In China, there are differences in the definition of freon, which is generally defined as the general name of halogenated compounds of saturated hydrocarbons (mainly methane, ethane and propane). According to this definition, freon can be divided into four categories: CFC, HCFC and HFC. Some scholars define freon as CFC refrigerant; Freon only refers to dichlorodifluoromethane (CCl? F? R12, a kind of CFC).

Freon is a volatile liquid or colorless gas at room temperature, tasteless or slightly odorous, non-toxic or low-toxic, and has stable chemical properties. Freon is widely used as refrigerant, foaming agent and cleaning agent, and is widely used in air conditioning and other electrical appliances, foam plastics, daily chemicals, automobiles, fire fighting equipment and other fields.

Extended information:

The average life span of Freon in the atmosphere is hundreds of years, so most of the emitted Freon remains in the atmosphere. When part of Freon rises to the stratosphere, it will be decomposed under the action of ultraviolet rays, in which chlorine-containing Freon molecules will separate chlorine atoms and then react with ozone, thus destroying the ozone layer.

Another hazard caused by the increase in the concentration of freon in the atmosphere is the greenhouse effect. Originally, most of the greenhouse effect on the earth's surface came from carbon dioxide in the atmosphere, and most freon have the same characteristics, and the effect is higher than that of carbon dioxide.

Reference: Baidu Encyclopedia-Freon