Technical information

The memory effect is dependent on a number of different influencing factors, such as manufac-turing parameters, tool/mold design, sealing compound, etc. When it comes to designing a memory packing, you can trust us to draw on years of experience. All you need to do is to provide us with your technical operating conditions. Please fill in the questionnaire under chapter “Technical Inquiry”.

Seal Design and Action Principle

The action principle of all seal types and shapes is iden-tical. The seals differ merely in terms of their geometries and applications.

 

Aufbau und Wirkungsweise

  • Sharp sealing edge
  • Back of seal
  • Flexible sealing lip
  • 4 Pressure/media side

The sealing effect is achieved by the inherent preload of the plastic casing (memory effect of the com-pound). The radial contact pressures are sufficient to effectively seal a pressureless application. In the event of additional system pressure the contact pressure forces will rise along with the total sealing pressure.

Aufbau und WirkungsweiseAufbau und Wirkungsweise

Displacement Force
This diagram shows the low displacement force of a memory packing compared to spring-energized seals and a hydraulic seal, a so-called O-ring-pre-loaded PTFE stepped ring (SRI). The low displacement force results from the low preload of the memory packing. It offers extremely favor-able friction behavior.

Verschiebekraft
orangeMemory packing type EMS
gelbSpring-energized seal type URI
blauStepped seal SRI with O-ring

Test Conditions
Hydraulic cylinder rod Ø 11 mm,
hard-chromium-plated, Rz 0.2 μm,
v = 60 mm/min, pressureless,
oil-lubricated, room temperature