PU / Polyurethane O-Rings

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Polyurethane o-rings are also known as Urethane o-rings or PU o-rings which are made of polyurethane rubber with an extremely low compression set. Polyurethane rubber is a series of elastomers containing more urethane groups on the polymer main chain, which should actually be polycarbamate rubber, referred to as polyurethane rubber or polyurethane elastomer.

Polyurethane o-rings are more resistant to extrusion than ordinary o-rings and are more suitable for environments with high impulse impact forces and space constraints that prevent the use of retaining rings.

Due to the high wear resistance of polyurethane o-rings, polyurethane o-rings are also suitable for dynamic sealing occasions, and the effect is not bad, such as the pilot valve seal of the air valve or the dynamic seal valve core of the main valve. They can also be used for positioning short-stroke clamping cylinders, or for valve body sealing with HFA hydraulic fluids but lacking lubrication.


  • Material: PU / polyurethane / Urethane
  • Temperature Range / Rating: -40 °C (-40 °F) to 90°C (194 °F)
  • Low Operating Temperature Limit: -40 °C (-40 °F)
  • Maximum Operating Temperature Limit: 90°C (194 °F)
  • Durometer Hardness Range: Shore A 40-90
  • Standard Durometer Hardness: Shore A 70
  • Less Used Duro Hardness: Shore A 50, 90
  • Color: Translucent (standard), blue is available
  • Outline: Round, square, rectangular, custom
  • Cross Section Shape: Round
  • Cross Section Width (CS): 0.5 to 20 mm (0.020 to 0.787 inch)
  • Inside Diameter (ID): 0.7 to 2965 mm (0.028 to 116.732 inch)
  • Standard Size: AS 568, BS 1806, ISO 3601, DIN 3771, JIS B 2401
  • Shelf Life: About one year
  • Price Level: Normal


Polyurethane o-rings perform high strength, excellent wear resistance, good oil resistance, and solvent resistance, especially for lubricating oil and fuel oil. PU o-rings have good swelling resistance, and good ozone resistance, but not high-temperature resistance.

Chemical Resistance Properties






PU o-rings are used to manufacture reciprocating seals and seals in a variety of wear and high strength applications. Polyurethane o-rings are commonly used in auto parts, marine equipment, aviation equipment, mining machinery, transportation, machinery, and other industrial fields.

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