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The only titanium oxide of commercial interest is titanium dioxide or titanic anhydride (TiO2), which gives the titanates of heading 28.41.
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 process in order to obtain certain physical properties rendering it suitable for use as a pigment (heading 32.06) or for other purposes (e.g., headings 38.15, 38.24).
The heading further excludes :(a) Natural titanium dioxide (rutile, anatase, brookite), an ore (heading 26.14). (b) Orthotitanic acid (Ti(OH)4) and metatitanic acid (TiO(OH)2) (heading 28.25).
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