Characteristics and performance

Hallite 668 twin lip static seal is designed to seal the joint between the gland and the cylinder bore or between the rod and the piston. The sealing element is a very effective replacement for the conventional O-ring and back-up ring combination in heavy-duty applications. The main advantage is its high groove stability compared to a conventional O-ring thus reducing fluid transfer caused by pumping.

Product details

Every nominal diameter of the Hallite 668 is suitable for a range of bore diameter, ØD₁ , or rod diameters, Ød₁.

The Hallite 668 is generally supplied as a bespoke part. Contact your local Hallite sales team for details.

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Max pressure *

500 Bar

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 +44 208 941 2244 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 suitablePossible
WaterNot suitableRecommended
Other fluid types  
Air/NitrogenNot suitableRecommended
HFD (Phosphate ester ARYL Type)Not suitableNot suitable
Synthetic esters (HEES, HFDU)Not suitableRecommended