Section 06 Products of the chemical or allied industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare - earth metals, of radioactive elements or isotopes 28 45 Isotopes (excl. radioactive); their inorganic or organic compounds Commodity Code Description 28 45 10 Heavy water (deuterium oxide) 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 Other