Chemours, the makers of FREON™ and OPTEON™ refrigerants. Together the future of refrigerants can be as simple as A,B,C with R-454A, R-454B, and R-454C. Major U.S. AC OEMs have selected R-454B (Opteon™ XL41) for air conditioning systems. R-454A (Opteon™ XL40) and R-454C (Opteon™ XL20) provide options for commercial refrigeration equipment.