COMPOUND FOR MANUFACTURING ELECTRICAL MACHINE BRUSHES Russian patent published in 2001 - IPC

FIELD: brushes for electrical machines including those used in railway and municipal transport. SUBSTANCE: compound incorporates coaltar pitch, furnace and thermal black, pitch coke, and phenol-formaldehyde resin, proportion of ingredients being as follows, mass percent: coal-tar pitch - 36-38; furnace black - 21-23.5; thermal black - 25-29.5; pitch coke - 5-6; phenol-formaldehyde resin - 3-4. EFFECT: improved environmental friendliness of manufacture and improved quality of brushes. 2 tbl, 2 ex