Characteristics and performance

This twin lip, asymmetric, single-acting piston seal with precision trimmed sealing lips provides a dry sealing solution in light and medium-duty application. The sealing lips are trimmed at an angle to give optimal rod sealing performance.

Designed to have an interference on the piston spigot diameter and has a secondary lip, the secondary sealing lip located behind the primary sealing lip improves stability of the seal in the piston. The outer dynamic lip is shorter and more robust to improving sealing and compression set characteristics over conventional, symmetrical U-rings.

The Hallite 659 is moulded in Hythane® 181, Hallite’s high-performance polyurethane, for easy installation and excellent low temperature performance. Depending on tube bore finish, the Hallite 659 is also offered in Hythane® 361 polyurethane.

Product details

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Max pressure

400 Bar

Temp range

-45°C
110°C

Max speed

1m/sec
Key:
  • 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  
AnyRecommendedRecommended
Waterbased fluids  
HFA (5/95)PossiblePossible
HFB (60/40 invert emulsion)RecommendedRecommended
HFC (water glycol)PossiblePossible
WaterPossiblePossible
Other fluid types  
Air/NitrogenPossiblePossible
HFD (Phosphate ester ARYL Type)Not suitableNot suitable
Synthetic esters (HEES, HFDU)RecommendedPossible