Characteristics and performance

Hallite PME back-up rings are uncut back-up rings made from specific conditioned PTFE to be assembled into one-piece external grooves. They are designed to support o-rings mainly in static applications.

The cold flow feature of the specially conditioned virgin PTFE grade reliably closes the extrusion gap and protects the o-ring from extruding into the gap and helps to reasonably increase the acceptable system pressure.

Product details

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Temp range


* Max pressure stated is dependant on the material variant selected. Please consult the datasheet for further information.

  • Recomended
  • Possible
  • Not suitable

* For fluid types marked as possible, please call our team of experts on +49 (0)40 73 47 48-0 to talk through your requirements and determine if this seal is the most suitable for your needs.

 Dynamic applicationStatic application
Fluids based on mineral oil  
AnyNot suitableRecommended
Waterbased fluids  
HFA (5/95)Not suitableRecommended
HFB (60/40 invert emulsion)Not suitableRecommended
HFC (water glycol)Not suitableRecommended
WaterNot suitableRecommended
Other fluid types  
Air/NitrogenNot suitablePossible
HFD (Phosphate ester ARYL Type)Not suitableRecommended
Synthetic esters (HEES, HFDU)Not suitableRecommended