Lubricity in friction linings must not necessarily be a contradiction. With its lubricating properties, graphite modulates the braking effect of friction linings and essentially contributes to braking comfort and to noise reduction. The outstanding thermal conductivity properties of graphite also play an important role in friction linings.
As electrical sliding contacts in an electric motor, carbon brushes at the same time have to meet the highest demands concerning resistance to wear and oxidation, electric and thermal conductivity, as well as lubricity. In this connection graphite plays a central role as an important component of many carbon brush formulas.