摘要 |
The invention provides a heat transfer composition consisting essentially of from about 45 to about 58 % by weight trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)) and from about 42 to about 55 % by weight of 1,1-difluoroethane (R-152a). The invention also provides a heat transfer composition comprising from about 40 to about 60 % by weight R-152a, from about 5 to about 50 % R-134a, and from about 5 to about 50 % by weight R-1234ze(E). |