Friction

               velocity

               contact surface

               load burdens   

               material of mutually sliding parts

The material and surface are of crucial importance for the

service life and functional reliability of a seal

Material

hard  sliding surface

Steel, steel coated
e.g. chromium-plated, cast iron

soft  sliding surface

Special steel, non-ferrous metals,

e.g. aluminium, bronze

Surface roughness and profile

Machining process, e.g.:

Drawing, turning, grinding, honing, 

compressing, 

e.g. roller-burnishing

Description through surface roughness and 

profiles

Rmax[µm], Ra[µm] , Rz[µm], Mr[%]