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

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Polypac Rod Seals for Hydraulic Cylinders

Polypac rod seals deliver reliable sealing for hydraulic cylinders with durable materials, precise manufacturing and tailored solutions. Ideal for harsh conditions, our seals reduce leakage, extend cylinder life and simplify maintenance.

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Product Details

Polypac Rod Seals for Hydraulic Cylinders

Polypac rod seals are engineered to provide dependable, low-friction sealing for hydraulic cylinder rods. Built from advanced materials and produced in our modern facility, these seals reduce leakage, resist wear, and keep your equipment running smoothly under tough conditions.

Key Features

Low friction design to improve efficiency and reduce heat.
Excellent wear and extrusion resistance for long service life.
Available in PTFE variants and common elastomers (NBR, FKM, EPDM, silicone, FFKM).
Precision manufacturing for consistent fit and performance.

Materials & Options

Polypac started with filled PTFE (bronze, carbon, graphite, MoS₂, glass) and now offers a wide range of elastomers and specialty compounds. We select materials based on temperature, pressure, fluid compatibility and working environment to ensure optimal performance.

Applications

Our rod seals suit mobile and industrial hydraulics: construction machinery, agricultural equipment, presses, injection molding machines and other systems where rod sealing is critical. They are ideal for systems requiring minimal leakage, smooth motion and extended maintenance intervals.

Why Choose Polypac

As a technical seal manufacturer founded in 2008, Polypac combines advanced production equipment with close collaboration with universities and research institutes. Our factory exceeds 10,000 m² and uses rigorous testing to ensure product reliability. We focus on practical sealing solutions that add measurable value—reducing downtime, lowering operating costs and protecting components.

Customization & Support

We provide custom rod seals and O-rings to meet special working conditions. From material selection to dimensional tolerances and special coatings, our engineering team delivers tailored solutions. Technical support and testing accompany every order to ensure the right seal for your application.

Contact Polypac for reliable rod seals that combine proven materials, precise manufacturing and responsive customization—protecting your hydraulic systems while improving uptime and performance.

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Q&A

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.

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.

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 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.

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