R-407C is a blend refrigerant developed as a substitute for HCFC-22. It is a mixture of HFC-32, HFC-125, and HFC-134a, and is a zeotropic refrigerant. It requires liquid filling to prevent change in composition. Its level of pressure is approximately the same as that of HCFC-22. It is highly compatible with ester oil and ether oil (It is not compatible with mineral oils like naphthenic oil etc. which is normally used with HCFC-22). Its moisture solubility is approximately the same level as that of HCFC-22.