95A Polyurethane / 70A Nitrile Energizer Hydraulic Piston Seal Assembly

Engineered for High-Pressure Hydraulic Piston Applications

This two-component piston seal assembly combines a 95A Shore A polyurethane primary seal with a 70A durometer nitrile (Buna-N) energizer to deliver consistent, leak-free performance across demanding hydraulic cylinder applications. The polyurethane outer seal provides exceptional abrasion resistance and extrusion resistance under high-pressure cycling, while the nitrile energizer maintains constant radial load against the bore for positive sealing at both static and dynamic conditions.

Key Performance Benefits

• Dual-material construction — polyurethane sealing lip backed by a nitrile energizer for sustained contact force
• High extrusion resistance — 95A durometer polyurethane withstands pressure spikes and side-loading in heavy-duty cylinders
• Broad fluid compatibility — nitrile energizer compatible with petroleum-based hydraulic fluids, water-glycol, and most mineral oils
• Low friction profile — optimized geometry reduces stick-slip and breakout force for smooth piston actuation
• Wide temperature range — suitable for continuous operation in standard industrial hydraulic environments

Typical Applications

• Hydraulic cylinders (mobile and industrial)
• Piston rod and bore sealing in MRO and OEM assemblies
• Construction, agricultural, and material handling equipment
• Press and injection molding hydraulic systems

Meets dimensional standards consistent with AS568 and ISO groove specifications. Verify bore diameter, groove dimensions, and operating pressure range against your cylinder design before installation.