Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 45 Isotopes other than those of heading 28.44; compounds, inorganic or organic, of Commodity Code Description 28 45 10 28 45 20 Boron enriched in boron-10 and its compounds 28 45 30 Lithium enriched in lithium-6 and its compounds 28 45 40 Helium-3 28 45 90