No.1 copper (96-98%) shall consist of clean, uncoated, unalloyed copper wire and cable, not smaller than No. 16 B & S wire gauge, free of burnt wire which is brittle. Hydraulically briquetted copper is a subject of agreement. This is usually copper pipe that has a “new appearance look” without any solder, paint or corrosion visible and no other material.
The usual commercial supplies of pure copper are used for the most critical of electrical applications such as the production of fine and superfine enameled wires. It is essential that purity is reproducibly maintained in order to ensure high conductivity, consistent anneal ability and freedom from breaks during rod production and subsequent wire drawing.
Since the applied enamel layers are thin but have to withstand voltage, they must have no surface flaws; consequently the basis copper wire must have an excellent surface quality.
Primary copper of the best grade is used for producing the rod for this work.
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