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satisfactory corrosion resistance (even in the conditions of high humidity of air copper is oxidized much more slowly, than, for example, iron; intensive oxidation of copper happens only at the increased temperatures);

Aluminum of high degree of purity (impurity no more than 0, 0,01%) the A999 and A995 brands is used for production of an anode and cathodic foil of electrolytic condensers and in microelectronics for receiving thin films.

Copper rather expensive and scarce material therefore it has to be spent economically. Copper waste at the electrotechnical enterprises needs to be collected, without mixing with other metals and less pure copper that they could be melted and again to use. In some cases copper as conduction material is replaced with other metals, most often aluminum.