When bearings are exposed to a constant movement in the housing or on the shaft, conventional sliding layers such as manga- nese phosphate or zinc phosphate may reach their limits
A PTFE layer is a polymer layer with excel- lent sliding properties, very low friction and no stick-slip properties It has high elasticity and primarily performs elastic deformation under stress Slidable polymer chains in the molecules make PTFE a dry lubricant, which can even transfer material to its sliding countersurfaces
With a PTFE coating the bearings receive longer lasting protection and significantly increased resistance against fretting and fretting corrosion

Partial surfaces, mainly the bore of inner rings and the outer diameter of outer rings, can be coated with a thick layer of polymer, e g polytetrafluoroethylene (PTFE) Curing PTFE in a furnace requires a temperature of 150 °C to 300 °C, has a very small friction coefficient (0.04), high temperature resistance (up to 400 ° C destroyed
In cases where ring movement in the housing is desired but fretting corrosion must be avoided, a basic approach is to use manganese phosphate or zinc phosphate
If the requirements are even higher, a PTFE layer will deliver long-term and low-friction sliding properties without fretting corrosion propagation