Polypac Heavy Duty Hydraulic Rod Seals

Polypac heavy duty hydraulic rod seals deliver low friction, long life and reliable leak prevention for harsh environments. Custom materials and precision manufacturing ensure optimal performance for demanding hydraulic systems.

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Product Information

Polypac Heavy Duty Hydraulic Rod Seals — Reliable Seal for Demanding Applications

Polypac heavy duty hydraulic rod seals are engineered for strength, durability and consistent leak-free performance. Designed for high-pressure hydraulic cylinders and tough working conditions, these rod seals minimize friction and wear while keeping fluid where it belongs.

Key Features

Low friction design for smoother operation and reduced energy loss.
Wide material options: filled PTFE variants (bronze, carbon, graphite, MoS2, glass) and elastomers such as NBR, FKM, silicone, EPDM, FFKM.
High resistance to abrasion, extrusion and chemical attack.
Wide temperature and pressure capability for extreme environments.
Precision molding and tight tolerances for consistent fit and long service life.

Why Polypac Seals Stand Out

Polypac combines advanced production equipment, strict testing and decades of material expertise. Our factory spans over 10,000 m2 with 8,000 m2 of production space, enabling high-volume consistency and fast custom runs. Starting from filled PTFE technology, we expanded to a full range of rubber O-rings and specialized formulations to meet unique field requirements.

We collaborate with leading universities and research centers to develop sealing compounds and validate performance. That means you get seals backed by real testing and continuous improvement — not just off-the-shelf parts.

Applications

Polypac heavy duty rod seals are ideal for:

Construction and mining machinery
Agricultural and material-handling equipment
Marine and offshore hydraulics
Industrial presses and heavy-duty cylinders

Customized Solutions & Support

Every application is different. Polypac offers tailored designs and material selections for special pressures, temperatures or chemical exposures. Our technical team helps choose or design the right seal to extend service life and reduce maintenance costs.

Choose Polypac heavy duty hydraulic rod seals for proven durability, precise manufacturing and flexible customization. Contact us to discuss specifications, samples or volume pricing and keep your hydraulic systems running stronger, longer.

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Frequently Asked Questions

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.

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 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.

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.

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