Urethane O-Ring (Polyurethane – PU, AU, EU) Material Description
The 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. We can also offer any type thermoplastic urethane (TPU).
Urethane o-rings are preferable for use with aliphatic hydrocarbons, ozone, water (up to 122ºF), mineral oils and greases, and silicone oils and greases. Urethane o-rings are not preferable for use with ketones, alcohols, esters, ethers, acids, glycols, alkalis, amines, hot water, and steam.
Cure system: Peroxide-cured
Standard PU 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