On Dec. 30, 2003, Protocol Resource Management Inc. was granted a U.S. patent for the refrigerant composition of SP22C, Protocol's blend of ozone friendly HFC refrigerants designed as a retrofit replacement for HCFC R-22. SP22C utilizes a patented formulation of HFCs and oil miscibility additives designed to enable the use of SP22C in R-22 air conditioning retrofit applications.
According to the company, SP22C does not require a system oil change and works with the existing mineral oil. The pressure, temperature, and operating characteristics of SP22C are designed to match R-22 in air conditioning applications. Performance in an optimized system exceeds that of R-22, and in a direct retrofit application, with no system modifications, SP22C performed within 4 percent of the original equipment manufacturers capacity rating, says the company. SP22C is nonflammable and has been tested for flammability according to UL2182 and ASTM E681.