Patent ID: 8049046

Claim:
A composition comprising: a. a refrigerant or heat transfer fluid comprising at least one unsaturated fluorocarbon selected from the group consisting of unsaturated fluorocarbons of the formula E- or Z—R 1 CH═CHR 2 , wherein R 1 and R 2 are, independently, C 1 to C 6 perfluoroalkyl groups; and b. at least one perfluoropolyether, wherein said perfluoropolyether has two end groups; wherein each of the two end groups of the perfluoropolyether, independently, is either an unfunctionalized, branched or straight chain pertluoroalkyl radical, or a functionalized group selected from the group consisting of esters, hydroxyls, amines, amides, cyanos, carboxylic acids and sulfonic acids; and wherein the amount of said perfluoropolyether is less than 1% by weight relative to said refrigerant or heat transfer fluid.