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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.

Heavy Duty U-Cup Display

FAQ:

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

How important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

Table of Contents

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Heavy Duty U-Cup Seals by Polypac
Performance and Materials
Design Advantages and Applications
Customization and Manufacturing Capability
Quality Assurance and Testing
Why Choose Polypac
Heavy Duty U-Cup Display

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