Section 05 Mineral products 27 Mineral fuels, mineral oils and products of their distillation; bituminous substances; mineral waxes 27 11 Petroleum gases and other gaseous hydrocarbons Commodity Code Description 27 11 11 - - Natural gas 27 11 12 - - Propane 27 11 13 - - Butanes 27 11 14 - - Ethylene, propylene, butylenes and butadiene 27 11 19 - - Other 27 11 21 - - Natural gas 27 11 29 - - Other