Impregnated carbon graphite material for electrical brushes - contains metal ultra phosphate and org. film forming hermetising agent

摘要

Carbon graphite material for brushes for electrical use contains distributed over its whole volume (a) a phosphorus cpd. comprising a metal ultraphosphate and (b) a hermetising agent comprising an org. film-forming polymer, to improve the contact properties of the carbon graphite material. The brushes have excellent contact props. even under high operating temps. (e. g. 200-250 degrees C) coupled with long brush life.