Heavy Duty U-Cup Seals by Polypac

Heavy Duty U-Cup Seals by Polypac

Polypac's Heavy Duty U-Cup line is engineered for demanding hydraulic and pneumatic applications where durability, low friction, and reliable sealing under high pressure are critical. Combining advanced materials with precision production, our U-Cup seals protect equipment, reduce downtime, and extend service life.

Performance and Materials

Our Heavy Duty U-Cup seals are available in a wide range of compounds—bronze-filled PTFE, carbon-filled PTFE, MoS2-filled PTFE, glass-filled PTFE, NBR, FKM, EPDM, silicone, and FFKM—to match fluid compatibility, temperature range, and wear resistance requirements. These material options ensure excellent extrusion resistance, low friction coefficients, and stable performance in harsh environments.

Design Advantages and Applications

The U-Cup profile delivers a self-energizing sealing lip that improves sealing under pressure while minimizing drag. Polypac Heavy Duty U-Cup seals are ideal for rod and piston applications, dynamic reciprocating systems, and static sealing under fluctuating loads—common in construction machinery, mobile hydraulics, injection molding, and industrial presses.

Customization and Manufacturing Capability

With a custom rubber ring and O-ring factory covering over 10,000 m² and 8,000 m² of production space, Polypac excels at bespoke Heavy Duty U-Cup production. We collaborate with universities and research institutes to develop tailored compounds and geometries for special working conditions, rapid prototyping, and volume manufacturing to OEM specifications.

Quality Assurance and Testing

Polypac employs industry-leading production and testing equipment to validate dimensional accuracy, hardness, compression set, and dynamic performance. Each Heavy Duty U-Cup undergoes rigorous inspection to meet international sealing standards and ensure consistent field performance and long service intervals.

Why Choose Polypac

Choosing Polypac for Heavy Duty U-Cup seals means partnering with a scientific and technical seal manufacturer committed to innovation, material science, and customer-focused customization. Contact Polypac for material recommendations, sample parts, and engineered sealing solutions that reduce leakage, improve energy efficiency, and protect critical hydraulic systems.