Freon is a trademark of E.I. du Pont for a series of chlorinated and fluorinated hydrocartoons. The parent hydrocarbons are methane, CH4, and ethane C2H6; a few Freons contain a bromine atom. Freon often use as AC refrigerant but this chemicals have been forbiden to use because it can depletion the ozone layer on the atmosphere. Freon is the synthetic refrigerant that can be build from several compostion of chemicals, several kind of freon as folows:
  • Chloro Fluoro Carbon, known as CFC
  • Hydro Chloro Fluoro Carbon, known as HCFC
  • Hydro Fluoro Carbon, known as HFC
The freons are chemically stable, nontoxic, and non flammable. Other useful properties are high density, low boiling point, and low viscosity. These characteristics make the freons especially suited for use as refrigerants. They have also been used as propellants in aerosol cans, as solvents, and to expand polyurethane insulating foams. Freons are fluorocarbons, the substances that have been implicated in the depletion of the ozone layer. In  1988 the du Pont company pledged to phase but production of fluorocarbons, and substitutes are being developed.

Because the using of the above chemicals have been forbiden by Government so there are other refrigerant as substitute those chemicals named as Hydrocarbon Refrigerant that more environmental friendly. The chemical formula of hydrocarbon refrigerant are HC-12® for substitute of CFC R12 and MC-134® as substitute of HFC R134a, HC-22® as substitute of HCFC-R22, and HC-600® as substitute of CFC R600.


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