Characteristics and performance

The Hallite 155 U-ring static seal replaces the conventional O-ring and back-up ring comb and is designed to seal the joint between the gland and the cylinder bore. Through its special design and polyester material compound, the seal will work with a maximum extrusion gap of 0.40 mm at 500 bar pressure.

This seal was developed for water-based, HFA, applications, but can also be used with standard mineral oil fluids.

Product details

Every nominal diameter of the Hallite 155 is suitable for a range of bore diameters, ØD₁.

See part number range 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 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 Not suitable
Water Not suitable Recommended
Other fluid types    
Air/Nitrogen Not suitable Possible
HFD (Phosphate ester ARYL Type) Not suitable Not suitable
Synthetic esters (HEES, HFDU) Not suitable Possible