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 CHAPTER 28

Inorganic chemicals; organic or inorganic compounds of precious metals, of
rare-earth metals, of radioactive elements or of isotopes

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 that the solvent does not render the product particularly suitable for specific use rather than for general use;

(d) The products mentioned in (a), (b) or (c) above with an added stabiliser (including an anti-caking agent) necessary for their preservation or transport;

(e) The products mentioned in (a), (b), (c) or (d) above with an added anti-dusting agent or a colouring substance added to facilitate their identification or for safety reasons, provided that the additions do not render the product particularly suitable for specific use rather than for general use.
 

(a) Oxides of carbon, hydrogen cyanide and fulminic, isocyanic, thiocyanic and other simple or complex cyanogen acids (heading No. 28.11);

(b) Halide oxides of carbon (heading No. 28.12);

(c) Carbon disulphide (heading No. 28.13);

(d) Thiocarbonates, selenocarbonates, tellurocarbonates, selenocyanates, tellurocyanates, tetrathiocyanatodia- minochromates (reineckates) and other complex cyanates, of inorganic bases (heading No. 28.42);

(e) Hydrogen peroxide, solidified with urea (heading No. 28.47), carbon oxysulphide, thiocarbonyl halides, cyanogen, cyanogen halides and cyanamide and its metal derivatives (heading No. 28.51) other than calcium cyanamide, whether or not pure (Chapter 31).

(a) Sodium chloride or magnesium oxide, whether or not pure, or other products of Section V;

(b) Organo-inorganic compounds other than 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 No. 32.06;

(e) Artificial graphite (heading No. 38.01); products put up as charges for fire extinguishers or put up in fire-extinguishing grenades, of heading No. 38.13, ink removers put up in packings for retail sale, of heading No. 38.24; cultured crystals (other than optical elements) weighing not less than 2.5 g each, of the halides of the alkali or alkaline-earth metals, of heading No. 38.24;

(f) Precious or semi-precious stones (natural, synthetic or reconstructed) or dust or powder of such stones (heading Nos. 71.02 to 71.05), or precious metals or precious metal alloys of Chapter 71;

(g) The metals, whether or not pure, metal alloys or cermets, including sintered metal carbides (metal carbides sintered with a metal), of Section XV; or

(h) Optical elements, for example, of the halides of the alkali or alkaline-earth metals (heading No. 90.01).
 

5. Heading Nos. 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 No. 28.42.

6. Heading No. 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, dispersions (including cermets), ceramic products and mixtures containing these elements or isotopes or inorganic or organic compounds thereof and having a specific radioactivity exceeding 74 Bq/g (0.002 micro Ci/g);

(e) Spent (irradiated) fuel elements (cartridges) of nuclear reactors;

(f) Radioactive residues whether or not usable.

The term "isotope", for the purposes of this Note and of the wording of heading Nos. 28.44 and 28.45, refers to :
 

- Individual nuclides, excluding, however, those existing in nature in the monoisotopic state;

- mixtures of isotopes of one and the same element, enriched in one or several of the said isotopes, that is, elements of which the natural isotopic composition has been artificially modified.
 

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 forms of discs, wafers or similar forms, they fall in heading No. 38.18
.