Section 05 Mineral products 27 Mineral fuels, mineral oils and products of their distillation; bituminous substances; mineral waxes 27 05 Coal gas, water gas, producer gas and similar gases, not petroleum gases 27 05 00 Coal gas, water gas, producer gas and similar gases, other than petroleum gases and .... Commodity Code Description 27 05 00 00 Coal gas, water gas, producer gas and similar gases, other than petroleum gases and ....