Measurement of critical properties of fluorinated ethers and amines

Using static-type apparatus, we measured critical properties of five fluorinated ethers and three fluorinated amines, which are expected to be promising candidates for advanced refrigerants, blowing agents and cleaning fluids. The advantage of the measuring apparatus was that a small amount of a sample was sufficient to determine the properties accurately. The uncertainties were ±30 mK in temperature, ±2 kPa in pressure, and ±0.2% in density for the critical properties. The critical properties were estimated fairly well by Lydersen's group contribution method.