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 Commodity Code Description 28 18 10 - Artificial corundum, whether or not chemically defined 28 18 20 - Aluminium oxide (alumina), other than artificial corundum 28 18 30 - Aluminium hydroxide