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

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Polypac Double Acting Piston Seal

Polypac Double Acting Piston Seal delivers durable, low-friction sealing for hydraulic cylinders. Precision-made, customizable, and rigorously tested for reliable performance in demanding conditions.

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Product Description

Product Overview

The Polypac Double Acting Piston Seal is designed to provide reliable sealing for hydraulic cylinders that operate under pressure in both directions. Built for durability and low friction, this seal reduces leakage and extends cylinder life while maintaining consistent performance across a wide range of temperatures and pressures.

Key Features

Double acting design for sealing on both piston faces
Low friction for smooth cylinder movement and reduced wear
High pressure capability with excellent extrusion resistance
Available in standard and custom sizes to fit OEM and repair needs
Supplied with compatible backup rings for extended life in high-pressure applications

Materials & Compatibility

Polypac manufactures these seals in a variety of proven materials, including PTFE variants and elastomers like NBR, FKM, EPDM, silicone, and FFKM. Material selection is based on fluid compatibility, temperature range, and abrasion resistance to ensure the best match for your application.

Applications

Commonly used in hydraulic cylinders for construction equipment, industrial machinery, mobile hydraulics, and agricultural systems. The double acting piston seal is especially suited to systems requiring bidirectional pressure sealing and reliable, long-lasting performance.

Why Choose Polypac

Polypac is a scientific and technical seal manufacturer and oil seal supplier with a strong focus on material development and customized solutions. Our factory spans over 10,000 m² with 8,000 m² of production space and advanced testing equipment. Since 2008 we have grown from filled PTFE production to a wide range of rubber O-rings and piston seals, and we work closely with universities and research institutes to keep quality and performance at the highest level.

Quality & Support

Every Polypac seal undergoes strict inspection and testing. We provide technical guidance for selection and installation, custom tooling for special sizes, and reliable lead times. Choose Polypac double acting piston seals for trustworthy performance and peace of mind.

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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.

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.

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.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

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PRODUCTS

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.

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