... refrigerant in automobile air-conditioning, householdand commericial refrigerant applications. It can also be used as aerosol,flame retardan and blowing agent ... refrigerant in automobile airconditioning, household and commercial refrigerant applications. It can also be used as aerosol, flame retardan, and blowing agent ... R12, replace the filter-drier, and charge R-134a. refrigerant refill