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

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Polypac Heavy Duty U-Cup Seal — Durable Hydraulic Sealing Solution

Polypac Heavy Duty U-Cup delivers reliable, long-lasting hydraulic sealing for high-pressure and abrasive environments. Engineered materials, tight tolerances, and custom options ensure superior wear resistance and low leakage.

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Product Description

Product Overview

The Polypac Heavy Duty U-Cup is a robust hydraulic seal designed for demanding applications. Built for high pressure, heavy wear, and frequent cycling, this U-Cup offers dependable performance in construction, mining, agricultural, and industrial equipment. Easy to install and compatible with standard grooves, it minimizes downtime and maintenance.

Key Features

High wear and abrasion resistance for long service life.
Excellent sealing performance under high pressure and dynamic conditions.
Low friction design for smoother operation and reduced heat build-up.
Available in multiple elastomers (NBR, FKM, EPDM, silicone, FFKM) and PTFE blends for tailored performance.
Precision manufacturing ensures consistent fit and reliable sealing.

Materials & Customization

Polypac leverages decades of sealing expertise. Choose standard rubber compounds or advanced filled PTFE options (bronze, carbon, graphite, MoS2, glass) for extreme conditions. We offer custom sizes, hardness, and compound formulations to match your specific fluid compatibility and temperature requirements.

Applications

Ideal for hydraulic cylinders, rods, pistons, and heavy-duty actuators used in construction machinery, hydraulic presses, agricultural equipment, and offshore systems.

Why Choose Polypac

Founded in 2008, Polypac is a scientific and technical seal manufacturer with a 10,000+ m² facility and advanced production and testing equipment. We collaborate with universities and research institutes to continuously improve materials and designs. Our experience with filled PTFE and a full range of O-ring materials means you get proven solutions backed by rigorous quality control.

Specifications & Ordering

Standard sizes available; custom machining on request. Contact Polypac with operating pressure, temperature, fluid type, and dimensions for a fast quote and sample. Choose Polypac Heavy Duty U-Cup for reliable sealing that extends equipment life and reduces maintenance costs.

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Question you may concern

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 NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

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.

If you have another questions, 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.

URD Series U-Cup Seal | High-Pressure & Anti-Extrusion Rod Seal

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URD Series U-Cup Seal | High-Pressure & Anti-Extrusion Rod Seal