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

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Polypac Hydraulic Piston Seal — Durable, Low-Friction Sealing

Polypac hydraulic piston seals provide reliable, low-friction sealing for mobile and industrial hydraulic systems. Manufactured with advanced materials and precise production, they ensure long life, low leakage, and stable performance in demanding conditions.

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Product Details

Product Overview

Polypac Hydraulic Piston Seal is designed to provide dependable sealing in hydraulic cylinders for industrial and mobile equipment. Built for low friction, long life, and consistent performance, our piston seals minimize leakage and maintain pressure stability across varied temperatures and working conditions.

Key Features

Reliable Sealing and Low Friction

Our piston seals use advanced molded and filled PTFE and elastomer combinations to reduce friction and wear. This means smoother operation, lower energy loss, and extended component life.

Wide Material Options

Polypac offers seals in a range of materials to suit different environments: NBR, FKM, silicone, EPDM, FFKM, and filled PTFE (bronze, carbon, graphite, MoS₂, glass). This flexibility lets you choose the best balance of chemical resistance, temperature range, and mechanical properties.

Custom and Precision Manufacturing

Our factory covers over 10,000 m² with an 8,000 m² production area and advanced testing equipment. We provide custom sizes and compound formulations to meet special working conditions and OEM requirements.

Applications

Polypac piston seals are suitable for hydraulic cylinders in construction machinery, agricultural equipment, material handling, presses, and industrial automation. They perform well in both high-pressure and dynamic environments.

Why Choose Polypac

Proven Experience and R&D

Founded in 2008, Polypac started with filled PTFE seals and has grown into one of China's leading seal manufacturers. We collaborate with universities and research institutes domestically and abroad to improve materials and designs.

Quality and Trust

With state-of-the-art production lines and strict testing, Polypac ensures consistent quality and reliable delivery. Our seals are made to reduce downtime and maintenance costs, helping you keep equipment running smoothly.

Ordering and Support

We offer standard sizes as well as custom solutions. Contact Polypac for material recommendations, drawings, or sample requests. Our technical team will help you select the optimal piston seal for your application.

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Q&A

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.

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.

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 can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

If you don’t find your answer, please E-mail us and we’ll be happy to help you out.

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