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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.).
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