R22 is a single-component HCFC refrigerant (Chlorodifluoromethane) with low ozone depletion potential. It has long been used in a variety of air conditioning and refrigeration applications in a variety of markets, including appliance, construction, food processing, and supermarkets. It is non toxic and non flammable meeting the highest A1/A1 classification.
HCFC's are commonly accepted as having an overall detrimental effect on the environment through both their ozone depletion potential and global warming potential and consequently are being phased out completely.