Recommendations for static sealing surfaces
Static sealing surfaces must also have a proper surface finish to enable the desired sealing performance (fig. 1).
The counter-surfaces of static seals exposed to pressure, including the static side of dynamic rod and piston seals, should have a roughness Ra ≤ 0,8 μm (30 μin.).
Seat diameters of guide rings and wiper seals should have a roughness of Ra ≤ 1,6 μm (63 μin.). Axial faces of all grooves should have a roughness of Ra ≤ 3,2 μm (125 μin.).