Bidirectional Piston Seal - Polypac

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.