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(A) ZINC OXIDE
Zinc oxide(zinc white, flowers of zinc) (ZnO), is prepared by passing a current of air over zinc brought to red heat; the zinc may be replaced by a mixture of oxidised zinc ores (roasted blende, calamine ‑ heading 26.08) and carbon. The gases pass through chambers forming deposits of increasingly pure oxides, the purest of which constitute flowers of zinc. Zinc oxide is a flaky white powder which turns yellow on heating.
Its uses include in paints instead of white lead, for the preparation of cosmetics, matches, oil‑cloth or ceramic glazes, as an opacifier and vulcanising accelerator in the rubber industry, as a catalyst, in the manufacture of glass, in the preparation of gas‑masks, or in medicine for the treatment of skin diseases.
The zincates of heading 28.41 correspond to this amphoteric oxide.(B) ZINC PEROXIDE
Zinc peroxide (ZnO2) White powder, insoluble in water. Used in medicine, either pure or with zinc oxide as impurity, and also for preparing cosmetics. This heading does not include : (a) Natural zinc oxide or zincite (heading 26.08). (b) Residues of zinc metallurgy known as zinc scurf, skimmings or dross, which also consist of impure oxides (heading 26.20). (c) Zinc hydroxide (Zn(OH)2) or gelatinous white, or the hydroperoxide (heading 28.25). (d) The impure zinc oxide, sometimes known as zinc grey (heading 32.06).
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