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Excavator Piston Seal — Polypac High-Performance Hydraulic Seals

Excavator Piston Seal Solutions by Polypac

Overview

Polypac offers a comprehensive line of Excavator Piston Seal products engineered to protect hydraulic cylinders in the most demanding earthmoving environments. Since 2008 we have specialized in advanced sealing systems and materials, expanding from filled PTFE technologies to a wide range of elastomers including NBR, FKM, EPDM, silicone and high-performance FFKM.

Materials & Design

Our Excavator Piston Seal designs combine low-friction filled PTFE composites (bronze, carbon, graphite, MoS2, glass) with high-strength elastomer backup rings to deliver reliable sealing under heavy loads. Seals are optimized for high pressure, rapid reciprocation and abrasive slurry conditions common to excavator hydraulic circuits, reducing wear and extending service life.

Performance & Testing

Polypac's 10,000+ sqm custom rubber and O-ring factory houses industry-leading production and testing equipment. Every Excavator Piston Seal undergoes stringent dimensional, pressure, leakage and durability testing. Our R&D collaborations with universities and research institutions ensure continuous improvement in frictional performance, extrusion resistance and temperature stability.

Customization & Manufacturing

We provide tailored sealing solutions — from material compound selection to profile geometry and tolerances — matched to specific working conditions. With advanced molding, machining and QA capabilities across an 8,000 sqm production area, Polypac delivers scalable manufacturing for OEMs and aftermarket needs, including rapid prototyping and small batch customization.

Applications & Benefits

Polypac Excavator Piston Seal products are ideal for hydraulic cylinders in excavators, backhoes and heavy construction equipment. Benefits include lower friction, improved energy efficiency, reduced maintenance intervals, and superior resistance to pressure spikes, heat and contaminated media.

Why Choose Polypac

As one of China’s largest dedicated seal manufacturers, Polypac combines material science, precision production and rigorous testing to create Excavator Piston Seal solutions that perform under extreme conditions. Contact us for specification support, material recommendations and custom seal development to extend equipment uptime and lower total cost of ownership.

Excavator Piston Seal Display

FAQ:

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.

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.

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 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.

Table of Contents

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Excavator Piston Seal Solutions by Polypac
Overview
Materials & Design
Performance & Testing
Customization & Manufacturing
Applications & Benefits
Why Choose Polypac
Excavator Piston Seal Display

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