Patent ID: 7410595

Claim:
A nonflammable refrigerant composition consisting of: (a) a mixture of pentafluoroethane trifluoromethyoxydifluoromethane, and hexafluoroethane wherein the mixtures is in an amount of 80-90% based on the weight of the composition; (b) a mixture of 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and trifluoromethoxypentafluoroethane, wherein the mixtures in an amount of 7.5-20% by weight based on the weight of the composition; and (c) hydrocarbon that is at least 70% isobutane in an amount of from 1-4% by weight based on the weight of the composition.