| 摘要 |
<p>Refrigerant compositions are disclosed which comprise: (a) pentafluoroethane, octafluoropropane, trifluoromethoxydifluoromethane or hexafluoro cyclopropane, or a mixture of two or more thereof, in an amount of at least 35 % 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 at least 30 % by weight based on the weight of the composition and (c) n butane or isobutane, in an amount from 1 % to less than 2.3 % by weight based on the weight of the composition.</p> |
