WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
28.23 - Titanium oxides. The only titanium oxide of commercial interes.t is titanium dioxide or titanic anhydride (TiOz), which gives the titanates of heading 28.4 1. It is an amorphous powder, specific gravity about 4; white but turns yellow when heated. This heading covers titanium dioxide that is not mixed or surface-treated, but it excludes titanium dioxide to which compounds have been intentionally added during the production rocess in order to obtain certain physical roperties renderin it suitable for use as a pigment fhe.ading 32.06) or for other purposes (e.g,Keadings 38.15,3?!?24). The heading further excludes : (a) Natural titanium dioxide (rutile, anatase, brookite), an ore (heading 26.14). (b) Orthotitanic acid (Ti(OH),) and metatitanic acid (TiO(OH)2)(heading 28.25).
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.