S1S seal tests under medium duty conditions

To verify that the S1S rod seal meets the intended functionality requirements and to validate its performance against similar competitive products, multiple benchmark tests were performed under medium duty and heavy-duty conditions.
The results of the verification testing are shown here with respect to leakage, seal extrusion length and friction force. In all three critical parameters for seal performance, the SKF S1S rod seal performed as good as or better than the competitor seals.
Additionally, the test results showed that the preload loss on the outer diameter as well as the lip cross section (which is a combination of compression set and seal wear) were excellent.

Leakage

S1S Leakage test results
Leakage
The S1S rod seal performed best in terms of overall leakage. Competitor 3 is second, but therefore shows drawbacks in terms of friction force and, as a result of this, an increased extrusion length.

Extrusion length

S1S Extrusion length test results
Extrusion length
The extrusion performance is a strong indicator for the material performance. The S1S rod seal is again showing excellent test results, whereas competition 2 and 3 are already showing increased extrusion length.

Friction force

S1S Friction Force test results
Friction force
The S1S rod seal is working on a comparably low friction level in combination with a superior leakage performance, whereas competitor seal 1 already requires a certain leakage to achieve a very similar frictional behaviour. Competitor rod seals 2 and 3 showed increased frictional forces caused by the extrusion length, which again loads the sealing material with higher temperatures.
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