| abstract |
[PROBLEMS] To contain (E) -HFO-1132 having a low global warming potential (GWP), which has little influence on the ozone layer, little influence on global warming, and excellent cycle performance. Provides a high heat cycle working medium. (E) -1,2-difluoroethylene and at least one selected from 1,1-difluoroethylene, fluoroethylene, fluoroethane, (Z) -1,2-difluoroethylene and ethylene A working medium for heat cycle containing the first compound. The ratio of each content of said 1st compound with respect to the sum total of content of said (E) -1,2- difluoroethylene and total content of said 1st compound is less than 0.5 mass% It is preferable that [Selection] Figure 1 |