Polyurethane O-rings are made of millable Polyurethane rubbers distinguished by two types; one is polyester urethane (AU), the other is polyether urethane (EU). AU type polyurethane o-rings have outstanding oil, fuel and solvent resistance but can be attacked by hydrolysis.
EU type polyurethane O-rings are not attacked by hydrolysis and still offer a fuel and oil resistance comparable to low ACN ( 18~22% ACN) nitriles or HNBRs. Any type polyurethane O-rings has excellent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers.
We also can offer any type thermoplastic urethane (TPU).
Service Temperature: The Service Temperature of PU is -40° C to 80° C, shortened lifetime up to 100 C.
Hardness: 60 to 93 Deg Shore A are available.
Color: Black, transparent, green, orange are available, or any assigned Color from customers.
Application: Polyurethane O-rings are usually are applied in mechanical industries, especially in places that require higher wear resistance and higher strength.Polyurethane O-Rings are especially suited wherever O-Rings are subject to dynamic loads. This includes, for example, applications in hydraulics, pneumatics and in a wide range of other critical areas. In many cases, polyurethane O-Rings are used instead of NBR due to their high mechanical strengths.