REFINED COPPER:

Metal containing at least 99,85 per cent by mass of copper; or

metal containing at least 97,5 per cent by mass of copper, provided that the content by mass of any other element does not exceed the limit specified in the following table:

COPPER ALLOYS:

Metallic substances (excluding unrefined copper) in which copper predominates by mass over each of the other elements, provided:

MASTER ALLOYS:

Alloys containing with other elements more than 10 per cent by mass of copper, not usefully malleable and commonly used as an additive in the manufacture of other alloys or as de-oxidants, de- sulphurising agents or for similar uses in the metallurgy of non-ferrous metals. However, copper phosphide (phosphor copper) containing more than 15 per cent by mass of phosphorus falls in heading 28.53.

COPPER-ZINC BASE ALLOYS (BRASSES):

Alloys of copper and zinc, with or without other elements. When other elements are present:

- zinc predominates by mass over each of such other elements;

- any nickel content by mass is less than 5 per cent (see copper-nickel-zinc alloys (nickel silvers)); and - any tin content by mass is less than 3 per cent (see copper-tin alloys (bronzes).

COPPER-TIN BASE ALLOYS (BRONZES):

Alloys of copper and tin, with or without other elements. When other elements are present, tin predominates by mass over each of such other elements, except that when the tin content is 3 per cent or more the zinc content by mass may exceed that of tin but must be less than 10 per cent.

COPPER-NICKEL-ZINC BASE ALLOYS (NICKEL SILVERS):

Alloys of copper, nickel and zinc, with or without other elements.The nickel content is 5 per cent or more by mass (see copper-zinc alloys (brasses)).

COPPER-NICKEL BASE ALLOYS:

Alloys of copper and nickel, with or without other elements but in any case containing by mass not more than 1 per cent of zinc.When other elements are present, nickel predominates by mass over each of such other elements.