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 +91 80 2372 6000 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