Characteristics and performance

The Hallite 667 polyurethane, single-acting piston seal for pneumatic applications design incorporates buffers to provide additional cushioning for pneumatic cylinders to prevent metal-to-metal contact at the end of the stroke, particularly if the retardation of the piston by the pneumatic cushion is insufficient. In turn, this additional buffering will reduce end stroke noise.

Manufactured in Hythane® 181, Hallite’s high-performance polyurethane, the Hallite 667 is easy to install with excellent low temperature performance and long service life.

The material combined with the design of the dynamic sealing lip offers low friction, significantly less than that of a rubber seal, and an ultra-long life.

Product details

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Max pressure *

16 Bar

Temp range


Max speed


* 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 Not suitable
Waterbased fluids    
HFA (5/95) Not suitable Not suitable
HFB (60/40 invert emulsion) Not suitable Not suitable
HFC (water glycol) Not suitable Not suitable
Water Possible Possible
Other fluid types    
Air/Nitrogen Recommended Possible
HFD (Phosphate ester ARYL Type) Not suitable Not suitable
Synthetic esters (HEES, HFDU) Not suitable Not suitable