Polyurethane Seals

KOK polyurethane seals are engineered for demanding hydraulic applications where abrasion resistance, extrusion control, and dimensional stability are critical to long service life.

Our compounds are selected and processed to provide consistent mechanical performance under dynamic load conditions, particularly in high-cycle reciprocating systems.

Performance Characteristics

• High Abrasion Resistance: Polyurethane compounds provide significantly improved wear resistance compared to conventional elastomers in contaminated or high-speed applications.
• Pressure Stability: Suitable for medium to high-pressure hydraulic systems where extrusion resistance is required.
• Chemical Compatibility: Compatible with mineral oils, water-glycol fluids, and common hydraulic media.
• Elastic Recovery: Maintains sealing contact under dynamic motion without excessive compression set.
• Operating Temperature Range: Typically -20°C to +120°C depending on compound selection.

KOK utilizes controlled molding and finishing processes to ensure dimensional consistency and repeatable performance across production batches.