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Polypac U-Cup Seal Kit

Polypac U-Cup Seal Kit provides durable, low-friction sealing for hydraulic cylinders and rods. Available in multiple compounds and sizes, the kit ensures long service life, easy installation, and reliable leak control—ideal for industrial and mobile hydraulics.

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Product Information

Polypac U-Cup Seal Kit — Reliable Sealing for Hydraulic Systems

Polypac U-Cup Seal Kit delivers a simple, effective solution for dynamic sealing in hydraulic cylinders. Designed for rods and pistons, the U-shaped lip provides strong sealing under pressure while keeping friction low for smooth operation.

What’s in the Kit

Each kit includes a range of U-cup seals and complementary components (such as backup rings and wipers where applicable) to cover common rod and piston sizes. Kits are available in standard sets or can be customized to fit your exact specifications.

Key Benefits

Long service life: High-quality rubber and PTFE compounds resist wear, extrusion, and aging for extended uptime.
Low friction: U-cup geometry reduces drag to improve efficiency and reduce heat.
Excellent leak control: Tight sealing under dynamic conditions minimizes maintenance and fluid loss.
Wide material choice: Available in NBR, FKM, EPDM, silicone, FFKM and PTFE blends to match temperature and chemical needs.
Easy installation: Flexible design simplifies assembly and replacement in the field.
Customizable: Polypac offers tailored solutions for special working conditions and non-standard sizes.

Why Choose Polypac

Founded in 2008, Polypac is a technical seal manufacturer with over 10,000 m² of facilities and advanced production and testing equipment. We began with PTFE-filled seals and now supply a broad range of rubber O-rings and high-performance materials. Close partnerships with universities and research institutions ensure ongoing material development and quality control.

Applications

Ideal for industrial hydraulics, mobile machinery, agricultural equipment, and any application requiring reliable rod or piston sealing under pressure and movement.

Choose Polypac U-Cup Seal Kit for proven performance, material expertise, and the ability to supply custom kits when standard sets aren’t enough. Contact us for size options, material recommendations, and fast delivery.

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Q&A

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 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.

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.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

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