In this Chapter the following expressions have the meanings hereby to them:

a) Zinc, not alloyed

Metal containing by weight at least 97.5% of Zinc.

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%.

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.