Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED 28 Inorganic chemicals;organic or inorganic compounds of precious metals, ofrare-earth, of radioactive elements or of isotopes 28 04 HYDROGEN, RARE GASES AND OTHER NON-METALS Commodity Code Description 28 04 10 Hydrogen 28 04 21 Argon 28 04 29 Other 28 04 30 Nitrogen 28 04 40 Oxygen 28 04 50 Boron; tellurium 28 04 61 Containing by weight not less than 99.99% of silicon 28 04 69 Other 28 04 70 Phosphorus 28 04 80 Arsenic 28 04 90 Selenium