Patent ID: 7771610

Claim:
A nonflammable refrigerant composition consisting of: (a) pentafluoroethane in an amount from 60% to 70% based on the weight of the composition; (b) a second component selected from the group consisting of 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and mixtures thereof in an amount from 26% to 36% by weight based on the weight of the composition; (c) a component that is in an amount of from 1% to 4% by weight based on the weight of the composition which is at least 70% isobutane and the remaining selected from the group consisting of n-butane, isobutane, n-pentane, isopentane, ethyl methyl ether, dimethyl ether and mixtures thereof; and (d) up to 2% by weight based on the weight of the composition of another fluorocarbon and wherein the fluorocarbon is selected from the group consisting of trifluoromethane, difluoromethane and mixtures thereof.