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Hydraulic Cylinder Seals — Polypac Precision Sealing Solutions

Hydraulic Cylinder Seals

High-performance sealing solutions for demanding hydraulics

Polypac Hydraulic Cylinder Seals are engineered to maintain fluid control, prevent contamination, and extend cylinder life under high pressure, temperature swings, and abrasive environments. Our seals combine advanced filler technologies—bronze, carbon, graphite, MoS₂, and glass-filled PTFE—with elastomeric O-ring options to deliver low friction, excellent wear resistance, and reliable dynamic sealing.

Comprehensive material portfolio

We offer a wide range of materials to match application needs: filled PTFE families for enhanced strength and low stick-slip, and elastomers including NBR, FKM, EPDM, silicone, and FFKM for static and dynamic sealing. Selecting the right compound ensures compatibility with hydraulic fluids, improved service life, and predictable performance under extreme conditions.

Custom design and precision manufacturing

Founded in 2008, Polypac combines R&D with precision production to create bespoke Hydraulic Cylinder Seals. Our 10,000+ m² facilities and 8,000 m² factory space house industry-leading molding, machining, and testing equipment, enabling close tolerances, repeatable quality, and rapid prototyping for unique cylinder geometries and special working conditions.

Rigorous testing and research partnerships

Polypac maintains long-term collaborations with universities and research institutions to validate seal compounds and designs. Comprehensive testing—pressure endurance, wear, chemical compatibility, and thermal cycling—ensures each Hydraulic Cylinder Seal meets or exceeds OEM and industry standards.

Industries served and application highlights

Our seals perform in mobile hydraulics, industrial presses, construction equipment, marine systems, and energy applications. Polypac solutions reduce downtime, improve efficiency, and lower total cost of ownership through optimized sealing performance.

Why choose Polypac?

As one of China’s largest dedicated seal manufacturers, Polypac delivers proven expertise in sealing material development, custom solutions, and scalable production. From prototype to volume supply, we offer technical consultation, material selection, and on-time delivery to meet your Hydraulic Cylinder Seals requirements.

Get started

Contact Polypac for a technical consultation or sample evaluation and discover tailored Hydraulic Cylinder Seals built for performance, longevity, and harsh conditions.

Hydraulic Cylinder Seals Display

FAQ:

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.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

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.

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.

Table of Contents

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Hydraulic Cylinder Seals
High-performance sealing solutions for demanding hydraulics
Comprehensive material portfolio
Custom design and precision manufacturing
Rigorous testing and research partnerships
Industries served and application highlights
Why choose Polypac?
Get started
Hydraulic Cylinder Seals Display

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