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Polypac Piston U-Cup — Reliable Hydraulic Piston Seals

Polypac Piston U-Cup is a durable, low-friction hydraulic piston seal designed for high-pressure and demanding environments. Manufactured in our advanced facility with multiple material options and custom solutions, it offers long life and reliable performance.

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Product Information

Product Overview

The Polypac Piston U-Cup is a precision-engineered hydraulic piston seal designed to deliver reliable sealing performance in cylinders and hydraulic systems. Built with decades of sealing expertise, this U-Cup seal balances low friction, strong sealing capability, and long service life. It is suitable for general hydraulic use and can be customized for special working conditions.

Why Choose Polypac Piston U-Cup

Proven Manufacturing & Quality

Polypac is a scientific and technical seal manufacturer with a modern factory covering over 10,000 square meters and an 8,000 square meter production area. Our advanced production and testing equipment ensure consistent quality. We collaborate with universities and research institutes to keep materials and designs up to date.

Material Options & Compatibility

We offer the Piston U-Cup in multiple materials to match application needs: PTFE variants (bronze-filled, carbon-filled, graphite, glass, MoS₂-filled) for low friction and high wear resistance, as well as elastomers like NBR, FKM, EPDM, silicone and high-performance FFKM for specific chemical and temperature requirements.

Key Benefits

Excellent sealing under high pressure and dynamic movement
Low friction design for smoother operation and less energy loss
Long service life with wear-resistant material options
Custom sizes and compounds for special environments
Consistent quality from advanced testing and production

Applications

The Polypac Piston U-Cup is ideal for hydraulic cylinders in construction machinery, industrial equipment, mobile hydraulics, and other systems requiring dependable piston sealing. Its adaptability makes it a good choice for both standard and harsh operating conditions.

Customization & Support

Polypac offers customized sealing solutions, from tailored compound selection to precision sizing. Our technical team can recommend the best material and design for your pressure, temperature and media. With decades of experience since 2008, Polypac provides responsive support and proven products you can trust.

Summary

The Polypac Piston U-Cup combines robust materials, careful manufacturing and flexible customization to deliver reliable sealing performance for demanding hydraulic applications. Choose Polypac for proven quality and long-term reliability.

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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.

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.

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.

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

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PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

UH Series U-Cup | Wear-Resistant Polyurethane Seal with Anti-Extrusion Ring

Polypac’s UH Series U-Cup is a wear-resistant polyurethane piston U-Cup featuring an anti-extrusion ring. Designed as a single-acting piston seal, it ensures high durability and reliable sealing performance in hydraulic applications. Ideal for long-lasting, efficient operation.

UH Series U-Cup | Wear-Resistant Polyurethane Seal with Anti-Extrusion Ring