Guideline values for the coefficient of friction µ of PTFE composite plain bearings
Using PTFE composite bearings as an example for the coefficient of friction µ under different operating conditions, the lowest values are normally obtained where there are high specific loads and low sliding velocities (diagram 1). Under particularly unfavourable operating conditions, like light loads, high velocities or inadequate surfaces, the maximum guideline values may be exceeded. The coefficient of friction µ for PTFE composite bearings increases at temperatures above +100 °C.
Similar values are found for the POM composite material, but the presence or constant supply of lubricating fluids serves to decrease friction.
Stick-slip effects are negligible for PTFE and POM bushings.
PTFE bushings typically have a running-in period (Bushing designs and variants).