Urethane O-Ring (Polyurethane – PU, AU, EU) Material Description


This image has an empty alt attribute; its file name is o-ring_clear_2952436.jpgThe millable Polyurethane (PU) rubbers are distinguished into two types; the first is polyester urethane (AU) and the other is polyether urethane (EU). AU type urethanes have outstanding oil, fuel and solvent resistance but can be attacked by hydrolysis. EU type urethanes are not attacked by hydrolysis and still offer a fuel and oil resistance comparable to low ACN (18 to 22% ACN) Nitriles or HNBRs.

Any type polyurethane has excellent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers. Global O-Ring and Seal offers urethane o-rings in 70 and 90 durometer. We can also offer any type thermoplastic urethane (TPU).

Urethane o-rings are typically transparent (clear) in color, and have an unlimited shelf life.

Cure System: Peroxide-Cured

Standard polyurethane compounds are peroxide-cured.

Urethane O-Ring Temperature Range:

Standard Low Temp: -40°C (-40°F)
Standard High Temp: 80°C (176°F)

SPEC SHEET: Urethane 70 Durometer

SPEC SHEET: Urethane 90 Durometer


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Preferred Environments to Use Urethane O-Rings

Performs Well In:

  • Aliphatic hydrocarbons
  • Mineral oil and grease
  • Silicone oil and grease
  • Ozone
  • Water up to 50ºC (122ºF) EU type

Doesn't Perform Well In:

  • Ketones
  • Alcohols
  • Esters
  • Ethers
  • Hot water and steam
  • Alkalis, amines
  • Acids
  • Glycols