R22 refrigerant gas is a hydrochlorofluorocarbon (HCFC) widely used in all sectors of refrigeration and air conditioning.
It has a low ODP value and excellent thermodynamic properties that make this refrigerant ideal for high and medium temperature applications in fixed installations, refrigerated transport and air conditioning.
Difluorochloromethane is related to the group of HCFCs. It has a low ozone depletion potential (ODP = 0.05) and a not very high global warming potential GWP = 1700, that is, the ecological characteristics of R-22 are better than those of R-12 or R-502.
It is a clear gas with a faint odor of chloroform, more poisonous than R-12, it is not explosive and does not combust in an oxygen atmosphere.
Compared to R-12, R-22 is less soluble in oil, but easily penetrates through pores and is inert to metals. The refrigeration industry produces high quality oils for R-22. At temperatures higher than 330ºC, R-22 decomposes in the presence of metals producing the same substances as R-12.
It’s fairly soluble in water. The moisture fraction in it should not exceed 0.0025%. The heat transfer coefficient during boiling and condensation is 25% – 30% higher than that of R-12.