Methane 84.6% 96.0%
Ethane 6.4% 2.0%
Propane 5.3% 0.6%
Iso-Butane 1.2% 0.18%
N-Butane 1.4% 0.12%
Iso-Pentane 0.4% 0.14%-
N-Pentane . 0.2% 0.06%
Hexanes 0.4% 0.10%
Heptanes 0.1% 0.80%
Carbon Di-Oxide 0 ~ 5%
Helium 0 ~ 5%
Hydrogen Sulphide 4.8 mg/Nm3 max
Total Sulphur 28.0 mg/Nm3 max
Nitrogen 2 ~ 10%
Argon 0 ~ 0.1%
Specific Energy Min1050
Btu/SCF Max 1150 Btu/SCF
Min 9532 Kcal/Nm3 Max 10,440 Kcal/Nm3
Calorific Value
Min 36.4 MJ/m3 Max40.9 MJ/m3
Chemical Symbol CH4
Molecular Weight 16
Normal Boiling Point -161 oCelsius
Freezing Temperature -183 oCelsius
Critical Temperature -82 oCelsius
Critical Pressure 47 bar absolute
Density of Saturated Liquid 424 kg/m3
Relative Gas Density 0.56 kg/m3
Latent Heat of Vaporization 512.4 KJ/kg
Flame Temperature 1880 oCelsius
Limiting Oxygen Index 11.5% by volume