| 摘要 |
PURPOSE:To obtain a mixed refrigerant which has a standard boiling point of -90 deg.C or lower, shows azeotropic behavior, provides an evaporation temperature of -90 deg.C or lower without making the evaporation pressure a negative pressure, and can embody very low temperature in, e.g. environmental test equipment. CONSTITUTION:Ethane is mixed with trifluoromethane and/or hexafluoroethane at a specified ratio represented by any of seven points on a triangular coordinate, i.e., a weight ratio of trifluoromethane to hexafluoroethane to ethane of (0.429:0.241:0.330), (0.405:0.232:0.363), (0.312:0.303:0.385), (0.242:0.430:0.328), (0.299:0.452:0.249), (0.350:0.420:0.230), or (0.425:0.307:0.268) and including the ratio represented by any point falling on or within circumference defined by the seven points. |
