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Polypac Polyurethane U-Cup Seal — Durable, Low-Friction Hydraulic Seal

Polypac Polyurethane U-Cup is a durable hydraulic seal offering low friction, long life, and easy installation. Ideal for high-pressure, reciprocating and static applications. Custom sizes and materials available from Polypac’s advanced factory.

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Product Information

Polypac Polyurethane U-Cup — Reliable Hydraulic Seals

Polypac's Polyurethane U-Cup is engineered for dependable sealing in hydraulic cylinders, rods, and pistons. Made from wear-resistant polyurethane, this U-shaped cup seal delivers excellent sealing performance with low friction and long service life. Designed for both dynamic and static applications, it’s a versatile choice for industrial, mobile, and offshore equipment.

Key Features

High wear and abrasion resistance for extended life
Low friction profile to reduce heat and energy loss
Excellent extrusion resistance under high pressure
Simple U-cup geometry for easy installation and reliable sealing
Available in custom sizes and compounds to match working conditions

Benefits

Using Polypac Polyurethane U-Cups reduces maintenance downtime and lowers replacement frequency thanks to superior material strength. Their low friction design improves efficiency and smooth operation. With strong extrusion resistance, these seals maintain performance in high-pressure systems and harsh environments.

Typical Applications

Suitable for hydraulic cylinders, piston rods, rams, presses, construction machinery, and agricultural equipment. Works well in reciprocating and oscillating movements and in systems where durability and leak-free performance are essential.

Materials & Customization

Polypac produces U-Cups from high-grade polyurethane compounds chosen for abrasion resistance and load capacity. We also offer tailored formulations and custom dimensions. Our large production facility and advanced testing equipment enable quick prototyping and reliable volume production.

Why Choose Polypac

Founded in 2008, Polypac combines deep sealing expertise with modern manufacturing. We partner with universities and research centers to stay at the forefront of sealing technology. With a 10,000+ m² facility and industry-leading equipment, we deliver consistent quality and fast delivery for OEMs and aftermarket customers.

Contact Polypac today for samples, material recommendations, and custom U-Cup solutions tailored to your application.

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Frequently Asked Questions

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 does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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 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.

If you have any questions about our goods or services, please feel free to contact us.

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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