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Polypac Long Life U-Cup Seal

Polypac Long Life U-Cup delivers durable, low-friction hydraulic sealing with excellent wear and extrusion resistance. Available in multiple elastomers and PTFE combinations, it suits cylinders, pistons and rods in demanding environments.

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Product Information

Polypac Long Life U-Cup — Overview

The Polypac Long Life U-Cup is a high-performance hydraulic seal designed for long service life and reliable operation. Engineered to minimize friction and resist wear, this U-cup reduces maintenance cycles and downtime. It is ideal for dynamic sealing on pistons and rods across a wide range of pressures and temperatures.

Key Benefits

Long-lasting performance with low friction for smooth operation
Excellent wear and extrusion resistance for heavy-duty use
Stable sealing across wide temperature and pressure ranges
Available in multiple materials for oil, water glycol, and specialty fluids
Easy to install and compatible with standard grooves

Materials & Compatibility

Polypac offers the Long Life U-Cup in combinations that match the working environment: PTFE-filled options for low friction and high wear resistance, and elastomers such as NBR, FKM, EPDM, silicone, and FFKM for fluid compatibility and sealing resilience. Custom blends and compounds are available on request.

Typical Applications

Hydraulic cylinders and rams
Pistons and rod seals in construction and agricultural machinery
Industrial presses and mobile hydraulics
Custom equipment operating under extreme or special conditions

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier with a focus on material development and customized solutions. Our factory spans over 10,000 square meters with 8,000 square meters of production space and advanced testing equipment. Since 2008 we have expanded from filled PTFE seals to a full range of O-rings and seals, collaborating with universities and research institutes to ensure quality and innovation.

Ordering & Support

We value your needs and offer consultation to select the right U-cup material and size. Custom sizes and compounds are supported for special working conditions. Contact Polypac for fast quotes, samples, and technical support to ensure the Long Life U-Cup meets your application requirements.

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Question you may concern

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

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.

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.

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.

If you have any other questions, please write email to us or call us , we will reply you ASAP.

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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.

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DDKK Piston Seal | Double-Lip Bidirectional U-Cup for Hydraulic Cylinders