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

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Polypac Piston Rod Seal for Hydraulic Cylinders

Polypac piston rod seals offer reliable, long-lasting sealing for hydraulic cylinders. Made with advanced materials and strict testing, our seals reduce leakage, extend service life, and support custom solutions for special working conditions.

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Product Information

Product Overview

Polypac piston rod seals are designed to protect hydraulic cylinders from leakage, contamination, and wear. Engineered for smooth performance and long service life, these seals suit construction equipment, agricultural machinery, industrial presses, and mobile hydraulics. Simple to install and compatible with common rod sizes, they deliver dependable sealing in both standard and demanding conditions.

Key Features

Excellent leakage prevention and rod protection
Low friction for smooth cylinder movement
High wear and extrusion resistance
Wide temperature and chemical compatibility
Available in standard sizes and custom dimensions

Materials & Customization

Leveraging Polypac’s deep experience with PTFE and elastomers, our piston rod seals are offered in a range of materials: bronze-, carbon-, graphite-, MoS2-, and glass-filled PTFE for high-performance needs, plus NBR, FKM, silicone, EPDM, and FFKM elastomers for O-rings and backup components. We provide tailored material choices to match pressure, temperature, speed, and fluid compatibility requirements.

Why Choose Polypac

Polypac is a scientific and technical manufacturer specializing in seal production, sealing material development, and customized solutions for special working conditions. Founded in 2008, we have grown into one of China’s largest seal developers. Our custom rubber ring and O-ring factory covers over 10,000 square meters with 8,000 square meters of factory space, and features advanced production and testing equipment.

Factory Capability & Expertise

We maintain ongoing cooperation with universities and research institutes to improve material formulas and sealing designs. Our quality control and testing ensure consistent performance so you can trust Polypac seals for critical applications.

Ordering & Support

Whether you need standard piston rod seals or a custom solution for extreme conditions, Polypac offers OEM support, sample testing, and fast quotations. Contact us with your rod dimensions, operating pressure, temperature range, and fluid type to get a tailored recommendation and competitive pricing.

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Question you may concern

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 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 important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

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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