Hallite PME back-up rings are uncut back-up rings made from specific conditioned PTFE to be assembled into one-piece external grooves. PME back-up rings 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. Hallite PME back-up rings are produced from stocked material and can be supplied on short notice.

  • Unit of measurement:
Unit of measurement:

Temp range

  • Recomended
  • Possible
  • Not Suitable

* For fluid types marked as possible, please call our team of experts on +44 208 941 2244 to talk through your requirements and determine if this seal is the most suitable for your needs.

  Dynamic application Static application
Fluids based on mineral oil    
Any Not suitable Recommended
Waterbased fluids    
HFA (5/95) Not suitable Recommended
HFB (60/40 invert emulsion) Not suitable Recommended
HFC (water glycol) Not suitable Recommended
Water Not suitable Recommended
Other fluid types    
Air/Nitrogen Not suitable Possible
HFD (Phosphate ester ARYL Type) Not suitable Recommended
Synthetic esters (HEES, HFDU) Not suitable Recommended