Physical and chemical properties Molar mass 26 g/mol Melting point -80.8 C Boiling point Boiling point Flash point Not applicable for gases and gas mixtures. Critical Critical temperature [�°C] 35 �°C Evaporation rate (ether=1) Not applicable for gases and gas mixtures. Flammability range 2.3 - 100 vol % Vapour pressure [20�°C] 44 bar(a) Vapour pressure [50 C] Not applicable. Relative density, gas (air=1) 0.9 Relative density, liquid (water=1) Not applicable. Solubility in water 1185 mg/l Partition coefficient n-octanol/water 0.37 Auto-ignition temperature 305 C Decomposition point [C] 635 C