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Bidirectional Piston Seal - Polypac

Polypac Bidirectional Piston Seals provide durable, low-friction sealing for hydraulic cylinders in demanding environments. Made from advanced PTFE and elastomers, customizable and fully tested for reliable performance.

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Product Information

Polypac Bidirectional Piston Seal Overview

Polypac Bidirectional Piston Seals are designed to provide dependable sealing for hydraulic cylinders that operate in both directions. Combining advanced PTFE compounds and high-quality elastomers, these seals deliver low friction, long service life, and stable performance under varying pressure and temperature conditions.

Key Features

Bidirectional sealing for push and pull strokes
Low friction to reduce wear and improve efficiency
Wide material choices: filled PTFE, NBR, FKM, EPDM, silicone, FFKM
Custom sizes and profiles to match specific cylinders
High resistance to extrusion, aging, and common hydraulic fluids

Materials & Construction

We use a range of engineered materials based on your application: bronze-, carbon-, graphite-, MoS₂-, and glass-filled PTFE for sliding faces, and durable elastomers for energizers. This combination ensures excellent sealing performance with minimal stick-slip and low leakage.

Applications

Ideal for hydraulic and pneumatic cylinders in construction equipment, agricultural machinery, industrial presses, and mobile hydraulics. Suitable for harsh environments where directional reversals and frequent cycles occur.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier with a 10,000+ m² facility and advanced production and testing equipment. Since 2008, we have specialized in filled PTFE seals and expanded to a wide range of O-ring materials. Our long-term collaborations with universities and research institutes ensure our products meet rigorous performance standards.

Quality & Customization

We offer tailored sealing solutions for special working conditions, with strict ISO-aligned testing to verify material properties, dimensional accuracy, and endurance. Our experienced engineers will help select the optimal material and profile to maximize seal life and system reliability.

Assurance

With Polypac’s Bidirectional Piston Seals, you get proven reliability, professional support, and the peace of mind that your hydraulic system is protected by components designed for real-world demands.

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Frequently Asked Questions

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.

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 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.

If you have any other questions, please write email to us or call us , we will reply you ASAP.

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dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

GSF Series Piston Seal | Compact Bidirectional Seal with Low Friction

Polypac GSF Series Piston Seal offers a compact, bidirectional piston seal design with low friction for enhanced performance. Ideal for optimized sealing in hydraulic cylinders, this compact piston seal ensures durability and efficient operation in demanding applications.

GSF Series Piston Seal | Compact Bidirectional Seal with Low Friction