| 摘要 |
A refrigerant composition is disclosed which comprises: (a) pentafluorethane, trifluoromethoxydifluoromethane or hexafluorocyclopropane, or a mixture of two or more thereof, in an amount of at least 75% based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of from 5 to 24 % by weight based on the weight of the composition and (c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, with a boiling point from -50 DEG C to -11 DEG C, or a mixture thereof in an amount from 1 % to 4 % by weight based on the weight of the composition, the weight ratio of component (a): component (b) being at least 3:1. These low temperature refrigerant compositions are suitable for use in cold storage applications.
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