| 摘要 |
<p>A composition is described which comprises (A) at least one compound selected from the group consisting of carbon dioxide (CO2) and the hydrofluorocarbons having a boiling point in the range of from -80 °C to -40 °C, (B) at least one hydrofluorocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane (R-134a), 1,1,2,2-tetrafluoroethane (R-134) and 1,1-difluoroethane (R-152a), and (C) at least one hydrofluorocarbon selected from the group consisting of 1,1,1,3,3,3-hexafluoropropane (R-236fa) and 1,1,1,2,3,3-hexafluoropropane (R-236ea). The composition is useful as a refrigerant and may be used in automobile air conditioning and domestic refrigeration systems as a replacement for refrigerant R-12.</p> |
