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

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Polypac Custom Piston Seals - Reliable Hydraulic Sealing Solutions

Polypac custom piston seals provide durable, precisely engineered sealing for hydraulic cylinders and special working conditions. Backed by advanced testing, diverse materials and decades of R&D, Polypac delivers reliable, customized sealing solutions.

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Product Description

Custom Piston Seals by Polypac

Polypac offers high-quality custom piston seals designed for hydraulic cylinders, industrial machinery, and demanding environments. Our seals combine proven materials and precision manufacturing to ensure long life, low leakage and stable performance under pressure.

Why Choose Polypac Custom Piston Seals?

Proven expertise since 2008 in PTFE-filled and rubber seal technologies.
Factory area over 10,000 m² and advanced production and testing equipment.
Collaboration with universities and research institutions for continuous improvement.

Materials and Options

We supply piston seals in a wide range of materials to match application needs, including bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS₂-filled PTFE, glass-filled PTFE, and elastomers such as NBR, FKM, silicone, EPDM, and FFKM. Custom blends and profiles are available for special temperatures, pressures and media.

Performance and Reliability

Each seal is engineered for minimal friction, strong extrusion resistance and consistent sealing under dynamic conditions. Our rigorous testing protocols and quality control reduce downtime and maintenance costs for our customers.

Custom Solutions for Special Conditions

Whether you need seals for extreme temperatures, aggressive fluids or unique sizes, Polypac provides tailored designs. Send your drawings or specs and our engineering team will recommend material and profile optimizations for your project.

Quality Assurance and Support

Polypac's production follows strict quality standards. Advanced inspection equipment and experienced technicians ensure each piston seal meets performance expectations. We also offer technical support during selection, prototyping and scaling to volume production.

Get Started

Contact Polypac for a consultation, sample or quote. Our goal is to deliver custom piston seals that provide dependable sealing, long service life and peace of mind for your hydraulic systems.

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Frequently Asked Questions

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.

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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.

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