dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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Polypac Wear Resistant U-Cup Seal

Polypac's Wear Resistant U-Cup is a high-performance hydraulic seal engineered for long service life in harsh environments. Featuring advanced materials, tight tolerances, and customizable options, it minimizes wear and prevents leakage for reliable operation.

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Product Information

Overview

The Polypac Wear Resistant U-Cup is a durable sealing solution designed for hydraulic and pneumatic systems that face high wear, pressure, and abrasive conditions. Built with the same engineering expertise that made Polypac a leading seal manufacturer, this U-cup offers dependable performance and long service life.

Why Choose Polypac U-Cup?

Polypac combines decades of sealing experience, advanced materials, and precise manufacturing to deliver seals you can trust. Our factory and testing facilities are among the most advanced in the industry, and we maintain partnerships with universities and research institutions for continuous improvement.

Key Benefits

High wear resistance — reduces maintenance frequency and downtime.
Excellent extrusion resistance — reliable under high pressure.
Low friction — smooth operation and energy efficiency.
Wide material options — PTFE-filled compounds, NBR, FKM, silicone, EPDM, FFKM.
Custom sizes and formulations — tailored to special working conditions.

Materials and Construction

The Wear Resistant U-Cup is available in a range of engineered materials. Initial Polypac expertise in filled PTFE (bronze, carbon, graphite, MoS₂, glass) ensures excellent sliding and wear properties. Elastomeric options such as NBR and FKM provide sealing flexibility and chemical compatibility. This combination of materials allows us to match the U-cup to your operating temperature, pressure, and fluid requirements.

Applications

Ideal for hydraulic cylinders, pistons, rods, and dynamic sealing points in mobile equipment, industrial presses, construction machinery, and marine systems. The U-cup design keeps seals stable under side loads and frequent motion.

Installation and Maintenance

Polypac U-cups are designed for easy installation and replacement. Proper groove design and lubrication extend service life. For critical applications, Polypac offers custom groove recommendations and testing support to ensure optimal performance.

About Polypac

Founded in 2008, Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier. Our custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space. We specialize in sealing material development, precision production, and tailored solutions for special working conditions.

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Contact Polypac for sample parts, material recommendations, and custom designs. Rely on our proven experience to keep your systems running longer and safer.

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Q&A

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.

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.

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.

Get in Touch

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.

UKH Piston Seal Kit | Single-Acting U-Cup with Anti-Extrusion Ring

Polypac’s UKH Piston Seal Kit features a wear-resistant single-acting U-Cup with an anti-extrusion ring. Designed for mobile equipment, this U-Cup seal kit ensures durability and optimal performance in demanding hydraulic applications. Reliable sealing for enhanced machine efficiency.

UKH Piston Seal Kit | Single-Acting U-Cup with Anti-Extrusion Ring