FIELD: electrical engineering. SUBSTANCE: invention, in particular, relates to electrical machines, operation of which is associated with high vibration level and high current density such as transport propulsion engines. Impregnation composition contains, %: film-forming oligomers (water-soluble phenol-formaldehyde resin), 10-30; 50-% orthophosphoric acid solution, 0.5-6.5; and furyl alcohol, the balance. EFFECT: improved performance characteristics of sliders due to reduced wear of commutator and reduced coefficient of sliders' vibration. 1 tbl
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