Polypac Replacement Piston Seals

Polypac replacement piston seals deliver durable, low-friction sealing for hydraulic systems. Made from advanced PTFE blends and elastomers, available in custom sizes and rigorously tested for reliable, long-life performance.

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Product Details

Product Overview

Polypac replacement piston seals are engineered to restore and enhance hydraulic cylinder performance. Designed for low friction, excellent wear resistance and consistent sealing under pressure, these seals fit a wide range of industrial and mobile hydraulic applications. Backed by Polypac’s large-scale production, advanced testing and decades of materials expertise, our piston seals provide reliable operation and longer service life.

Features and Benefits

Long-lasting: Advanced filled PTFE and High Quality elastomer options resist wear and extrusion for extended service intervals.
Low friction: Smooth operation reduces energy loss and heat, improving efficiency and response.
Reliable sealing: Consistent contact and tight tolerances minimize leakage under high pressure.
Easy replacement: Designed for straightforward installation to reduce downtime.
Versatile use: Suitable for hydraulic cylinders in construction, agriculture, machine tools and more.

Materials & Customization

Polypac offers a broad material range to meet specific working conditions: bronze-, carbon-, graphite-, MoS₂- and glass-filled PTFE for demanding environments, plus NBR, FKM, silicone, EPDM and FFKM elastomers for varied chemical and temperature needs. Our in-house development and testing let us tailor hardness, profile and tolerance for special pressures, temperatures or shaft finishes.

Why Choose Polypac

Founded in 2008, Polypac combines a 10,000+ m² production facility with leading equipment and long-term research partnerships. We focus on sealing material development and customized solutions for special conditions. Our production standards and quality testing ensure every replacement piston seal meets strict performance criteria.

Whether you need a direct replacement or a custom sealing solution, Polypac delivers reliable seals that extend equipment life and cut maintenance costs. Contact us for material guidance, CAD-supported design and fast quoting.

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Q&A

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.

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

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.

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