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Nigeria3207 20 90 · Other
This subheading basically covers vitrifiable compositions. These are products which are generally in the form of powders, granules or flakes which when heated vitrify to produce a smooth homogeneous surface on ceramic or metal goods. This surface may be glossy or matt, coloured or white, transparent or opaque.
These products can be made up as follows:
1. from mixtures, reduced to powder, of glass frit of subheading 3207 40 85 with other materials such as silica, feldspar, kaolin, pigments, etc.;
2. from mixtures, reduced to powder, of silica, feldspar, kaolin, calcium carbonate, magnesium carbonate, etc. (i.e., the components of glass frit which are insoluble in water) and, possibly, of pigments.
These two types of vitrifiable compositions produce transparent coatings, either coloured or uncoloured;
3. from the products mentioned at 1 and 2 above, with the addition of opacifiers. In this case, the opaque coatings obtained are white or coloured;
4. from frits in the form of powders, granules or flakes — constituted and obtained as indicated in the explanatory note to subheadings 3207 40 40 and 3207 40 85 — but which contain, in addition, coloured pigments or opacifiers and sometimes oxides, to facilitate adhesion of the coating to metallic surfaces.
The coloured pigments used for the manufacture of products of this subheading include oxides and salts of cobalt, nickel, copper, iron, manganese, uranium and chromium.
Tin oxide, zirconium oxide and zirconium silicate, titanium oxide and arsenious anhydride may be added as opacifiers.
Nickel and cobalt oxide may be added to facilitate the adherence of the coating to metallic surfaces.