Polypac Rod Seals for Hydraulic Cylinders

Polypac rod seals deliver low friction, long wear life and dependable sealing for hydraulic cylinders. Custom materials and precision manufacturing ensure performance in high pressure, temperature and harsh environments.

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Product Description

Polypac Rod Seals for Hydraulic Cylinders

Polypac rod seals are engineered to keep hydraulic cylinders running smoothly and reliably. Designed for low friction, excellent wear resistance and tight sealing under pressure, our rod seals reduce leakage and extend equipment life. Whether for construction machinery, industrial presses or mobile hydraulics, Polypac provides seals that perform in real-world conditions.

Why choose Polypac rod seals?

Low friction and smooth operation reduce energy loss and stick-slip.
Durable materials resist wear, extrusion and aging for longer service intervals.
Stable sealing under high pressure and wide temperature ranges.
Precise dimensions and consistent quality thanks to advanced production and testing equipment.

Materials and customization

Polypac began with filled PTFE products and now offers a wide range of sealing materials to match application needs. Available materials include PTFE variants (bronze, carbon, graphite, MoS2, glass-filled) and elastomers such as NBR, FKM, silicone, EPDM and FFKM. We provide custom formulations and sizes for special working conditions, including aggressive media, extreme temperatures and heavy loads.

Manufacturing strength and quality

Our custom rubber ring and O-ring factory covers over 10,000 square meters, with 8,000 square meters of factory space. We invest in advanced production and testing equipment and maintain partnerships with leading universities and research institutions. This translates to fast development, consistent quality and reliable delivery for both standard and bespoke rod seals.

Benefits for your operation

Polypac rod seals help reduce downtime, lower maintenance costs and improve machine efficiency. Clear advantages include longer seal life, fewer replacements, and predictable performance in tough environments. Our experienced team can recommend the best material and design for your application, or produce custom shapes for unique needs.

Choose Polypac for rod seals that combine proven materials, modern manufacturing and responsive service. Contact us to discuss specifications, samples or volume orders and discover how better sealing improves your hydraulic systems.

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Question you may concern

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.

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.

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 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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