. PROPERTIES Properties Propane Butane Unit Density of liquid 0.512 0.590 kg/liter Density of the vapor compared to air 1.87 2.44 kg/m³ Boiling temp.(liquid -->vapour) -42 -0,5 °C Solidification temp. (liquid --> solid) -187 -138 °C Auto-ignition temperature 495 480 °C Calorific value 13.840 13.723 kWh/kg Calorific value 11.900 11.800 kcal/kg Calorific value 49 49 Mj/kg Latent heat of vaporisation 356 362 kJ Latent heat of vaporisation 85 86,5 kcal/kg Vapour pressure at 5°C 4,7 0,8 bar Vapour pressure at 15°C 6,5 1,7 bar Max. temperature flame whith air 1.925 1.895 °C Max. temperature flame with oxygen 2.850 2.820 °C Gas/liquid ratio 270 230 . Perfect combustion in air 23 29.5 m3/m3 Lower explosion limit 2.4 1.8 % Upper explosion limit 9.3 8.8 % Maximum filling level (ADR) 0,42 0,50 kg/l

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