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Carbon brushes from the new graphite-polymeric materials EF-68 and FE6X have high physico-mechanical and collector characteristics. The materials passed a full cycle of bench tests at the certified center of the SE Plant Electrotyazhmash. The above-mentioned materials are characterized by: low wear, reduced coefficient of friction (0.13-0.16) when the total voltage on a pair of brushes drops to 1.6-3.2 V and a uniform brush film, which is fast formed.

A key feature of these materials is that they work instead of several completely different classes of brush materials: EG61A, G-27, MGS8. This list is by no means exhaustive.

Determination of the optimum sliding electric contact operating conditions based on minimum energy release conditions

A huge amount of research has been devoted to issues related to optimum working conditions of sliding electric contacts (e.g. carbon brushes). A considerable number of theories, has been put forward, more or less successfully describing some individual cases. Every self-respecting manufacturer (and we are no exception) shall certainly indicate the operating conditions of all own brands of carbon brush materials which he sees optimal.All the brochures dedicated to carbon brushes by all means specify the maximum permissible collector linear speed, the suggested brush pressure, normal current density, the coefficient of friction and contact voltage drop across a pair of brushes. All manufacturers of electric machines consider themselves to know the optimum collector temperature and a lot of other sliding contact parameters. However, up to now the trial and error method has been the only way to select carbon brushes for a newly created machine.

Manufacture of these carbon pillars are carried out only according to customer drawings or samples of the desired product.