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Polypac Compact Piston Seal — Precision Sealing for Hydraulic Systems

Polypac Compact Piston Seal — Precision Sealing for Hydraulic Systems

Overview

The Compact Piston Seal from Polypac is designed to combine minimal installation space with maximum performance. Engineered for modern hydraulic cylinders where space and efficiency are critical, this Compact Piston Seal ensures reliable pressure retention, low hysteresis and reduced wear — improving cycle life and system responsiveness. Ideal for mobile hydraulics, industrial actuators and compact power units, it balances sealing integrity with optimized friction.

Key Features

Polypac Compact Piston Seal features precision-molded profiles and engineered contact geometries that deliver consistent sealing at high pressures and variable speeds. Features include low friction surfaces, enhanced extrusion resistance, and stable sealing lip geometry. These characteristics reduce leakage, minimize energy loss, and extend maintenance intervals, making the seal an economical choice for long-term operation.

Materials & Customization

Polypac offers Compact Piston Seal solutions in advanced materials tailored to application demands. Starting from our heritage in filled PTFE (bronze, carbon, graphite, MoS2, glass-filled), we also supply elastomeric components in NBR, FKM, EPDM, silicone and FFKM. Custom blends and composite constructions can be developed for special media, extreme temperatures, or abrasive environments — enabling bespoke Compact Piston Seal designs for unique working conditions.

Applications

Compact Piston Seal applications span mobile equipment, construction machinery, agricultural hydraulics, industrial presses and aerospace actuators. Wherever compact cylinder bores, high cycle rates and demanding duty cycles are present, the Compact Piston Seal provides dependable sealing performance without compromising stroke or cylinder packaging.

Quality Assurance & Testing

Manufactured in Polypac’s 10,000+ m² facility with 8,000 m² of factory space and advanced production/testing equipment, each Compact Piston Seal undergoes rigorous dimensional, material and performance validation. Long-term collaborations with universities and research institutes underpin our R&D and ensure compliance with international standards and demanding custom requirements.

Why Choose Polypac

As an award-winning hydraulic seal manufacturer, Polypac combines material science, precision manufacturing and responsive customization. Choose Polypac Compact Piston Seal for proven durability, tailored material options and global technical support — contact us for samples, CAD profiles and application-specific sealing solutions.

Compact Piston Seal Display

FAQ:

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.

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 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.

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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Polypac Compact Piston Seal — Precision Sealing for Hydraulic Systems
Overview
Key Features
Materials & Customization
Applications
Quality Assurance & Testing
Why Choose Polypac
Compact Piston Seal Display

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