Hydrogen, rare gases and other non-metals. - Rare gases: - Other - Helium

1. 1. Except where the context otherwise requires, the headings of this Chapter apply only to: • (a) Separate chemical elements and separate chemically defined compounds, whether or not containing impurities; • (b) The products mentioned in (a) above dissolved in water; • (c) The products mentioned in (a) above dissolved in other solvents provided that the solution constitutes a normal and necessary method of putting up these products adopted solely for reasons of safety or for transport and...

2. 2. In addition to dithionites and sulphoxylates, stabilised with organic substances (heading 28.31), carbonates and peroxocarbonates of inorganic bases (heading 28.36), cyanides, cyanide oxides and complex cyanides of inorganic bases (heading 28.37), fulminates, cyanates and thiocyanates, of inorganic bases (heading 28.42), organic products included in headings 28.43 to 28.46 and 28.52 and carbides (heading 28.49), only the following compounds of carbon are to be classified in this Chapter:...

3. 3. Subject to the provisions of Note 1 to Section VI, this Chapter does not cover: • (a) Sodium chloride or magnesium oxide, whether or not pure, or other products of Section V; • (b) Organo-inorganic compounds other than those mentioned in Note 2 above; • (c) Products mentioned in Note 2, 3, 4 or 5 to Chapter 31; • (d) Inorganic products of a kind used as luminophores, of heading 32.06; glass frit and other glass in the form of powder, granules or flakes, of heading 32.07; • (e) Artificial...

4. 4. Chemically defined complex acids consisting of a non-metal acid of sub-Chapter II and a metal acid of sub-Chapter IV are to be classified in heading 28.11.

5. 5. Headings 28.26 to 28.42 apply only to metal or ammonium salts or peroxysalts. Except where the context otherwise requires, double or complex salts are to be classified in heading 28.42.

6. 6. Heading 28.44 applies only to: • (a) Technetium (atomic No. 43), promethium (atomic No. 61), polonium (atomic No. 84) and all elements with an atomic number greater than 84; • (b) Natural or artificial radioactive isotopes (including those of the precious metals or of the base metals of Sections XIV and XV), whether or not mixed together; • (c) Compounds, inorganic or organic, of these elements or isotopes, whether or not chemically defined, whether or not mixed together; • (d) Alloys,...

7. 7. Heading 28.53 includes copper phosphide (phosphor copper) containing more than 15% by weight of phosphorus.

8. 8. Chemical elements (for example, silicon and selenium) doped for use in electronics are to be classified in this Chapter, provided that they are in forms unworked as drawn, or in the form of cylinders or rods. When cut in the form of discs, wafers or similar forms, they fall in heading 38.18.