Parker’s Resilon® 568 Profile polyurethane O-rings provide the material advantages of Resilon polyurethanes in standard O-ring sizes.  The high extrusion resistance of the Resilon family of polyurethane materials eliminates the need for a back-up in many hydraulic applications, thereby simplifying installation and reducing groove width.

Resilon’s unmatched temperature rating makes it suitable in applications where other urethanes fail.  In addition, Resilon 4301 polyurethane provides superior water resistance and compression set resistance in water-based fluids.  Premium urethane O-rings are much less prone to spiral failure and installation damage compared with rubber O-rings. 

For use in static and dynamic applications for hydraulics and pneumatics, the dimensions and tolerances of Parker Resilon 568 Profile O-rings match up with AS568B size specifications for diameter and cross-section and are used in the same grooves.

Parker’s proprietary Resilon polyurethanes in the O-ring profile deliver: 
• Long life
• Extrusion resistance
• Low compression set
• Greater resistance to spiral failure

Standard Materials:
• P4300A90 Resilon® polyurethane; Temp -65 / +275F; Dynamic Pressure 5,000 psi; Static Pressure 10,000 psi
• P4301A90 Resilon® polyurethane; Temp -35 / +275F (+225F in water); Dynamic Pressure 5,000 psi; Static Pressure 10,000 psi

Typical applications: 
• Static and dynamic sealing of hydraulic & pneumatic cylinders and equipment components, including:  accumulators, actuators, pumps, and valves