Chemical name: tetrafluoroethane (R134a) Molecular formula: CH 2 FCF 3 Molecular weight: 102.03 Boiling point: -26.26 ℃ freezing point: -96.6 ° C Critical temperature: 101.1 ℃ Critical pressure: 4067kpa saturated liquid density: 25 ℃, 1.207g/cm 3 Specific heat of liquid: 25 ℃, 1.51KJ / (Kg · ℃) Solubility (water, 25 ℃): 0.15% critical density: 0.512g/cm3 Ozone depletion potential (ODP): 0 Global Warming (GWP) : 1300 Boiling Point Vaporization: 215 kJ / kg Another Note: R134a in the country is generally regarded as environmentally friendly refrigerants. However, due to the high GWP, there is a big controversy in Europe, has now been included in the process of elimination. So just as the transition to environmentally friendly R134a product alternatives, phasing out only a matter of time.