Section 06 Products of the chemical or allied 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare earth metals, of radioactive elements or isotopes 28 18 Artificial corundum, whether or not chemically defined; aluminium oxide; aluminium hydroxide 28 18 20 - Aluminium oxide (alumina), other than artificial corundum 28 18 20 00 - Aluminium oxide (alumina), other than artificial corundum Commodity Code Description 28 18 20 00 000 - Aluminium oxide (alumina), other than artificial corundum