Rules
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subheading notes
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1.
In this Chapter the following expressions have the meanings hereby assigned to them
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(a) Zinc, not alloyed Metal containing by weight at least 97.5% of zinc.
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(b) Zinc alloys Metallic substances in which zinc predominates by weight over each of the other elements, provided that the total content by weight of such other elements exceeds 2.5%.
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(c) Zinc dust Dust obtained by condensation of zinc vapour, consisting of spherical particles which are finer than zinc powders. At least 80% by weight of the particles pass through a sieve with 63 micrometres (microns) mesh. It must contain at least 85% by weight of metallic zinc.
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