Polypac Long Life U-Cup Seals — Reliable, Long-Lasting Hydraulic Seals

Polypac Long Life U-Cup — Engineered for Extended Service Life

Polypac Long Life U-Cup seals are designed to provide durable, efficient sealing in demanding hydraulic environments. Leveraging our decades of material science and seal manufacturing expertise, the Long Life U-Cup maximizes wear resistance and minimizes leakage across a wide range of pressures, speeds and temperatures.

Key Features and Benefits

The Long Life U-Cup features a proven geometry that reduces friction and stabilizes lip contact, delivering consistent sealing and long-term performance. Benefits include reduced downtime, lower maintenance costs, improved energy efficiency, and compatibility with both reciprocating and rotary applications.

Advanced Materials and Precision Manufacturing

Polypac manufactures Long Life U-Cup seals using industry-leading elastomers and engineered blends, including NBR, FKM, EPDM, silicone and specialty PTFE compounds. Our 10,000+ m² facility employs state-of-the-art molding and testing equipment to ensure dimensional accuracy, hardness control and material homogeneity—critical factors for extended seal life.

Applications and Operating Conditions

Long Life U-Cup seals are ideal for hydraulic cylinders, piston rods, pumps and actuators used in mobile equipment, industrial machinery, aerospace and marine systems. They perform reliably under high pressure, frequent cycling and contaminated environments when paired with appropriate materials and surface finishes.

Customization, Testing and Quality Assurance

As a scientific and technical seal manufacturer, Polypac offers tailored Long Life U-Cup solutions for special working conditions. We collaborate with universities and research institutes to validate designs and provide comprehensive testing—tensile, compression set, hardness, and simulated lifecycle testing—to guarantee product performance and compliance.

Why Choose Polypac

Founded in 2008, Polypac combines material innovation with production scale to deliver reliable Long Life U-Cup seals. Our expertise in filled PTFE and a wide portfolio of elastomers, plus responsive custom engineering services, make us the partner of choice for OEMs and maintenance teams seeking long-term sealing performance.

Get Started

Contact Polypac for application assessment, material recommendations and rapid prototyping of Long Life U-Cup seals. Optimize your hydraulic systems with seals engineered for life—reduce leaks, extend service intervals, and protect critical equipment.