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Piston Seal for Excavator Cylinder — Polypac High‑Performance Seals

Piston Seal for Excavator Cylinder by Polypac

Overview

Polypac offers engineered piston seal for excavator cylinder designed to withstand extreme pressures, abrasive media and wide temperature ranges. Combining decades of sealing expertise with advanced materials—bronze, carbon, graphite, MoS2 and glass-filled PTFE—our seals deliver low friction, long life and precise sealing for heavy-duty hydraulic cylinders.

Why Choose Polypac Piston Seals

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier with a dedicated 10,000+ m² facility. Our piston seal for excavator cylinder benefits from industry-leading production equipment, rigorous testing, and ongoing R&D partnerships with universities and research institutions to ensure consistent quality and performance.

Materials and Customization

We supply piston seals in advanced filled PTFE compounds (bronze, carbon, graphite, MoS₂, glass) and a wide range of elastomers including NBR, FKM, silicone, EPDM and FFKM. Polypac customizes hardness, coatings and dimensional tolerances to meet specific cylinder geometries and working conditions for optimal wear resistance and sealing efficiency.

Manufacturing and Quality Assurance

Our factory’s 8,000 m² production space houses precise molding, machining and testing equipment to control tolerances and material integrity. Each piston seal for excavator cylinder undergoes pressure, leakage and friction testing to meet OEM and application standards—ensuring reliability in mining, construction and heavy equipment fleets.

Applications and Performance Benefits

Piston seals from Polypac excel in excavator cylinders exposed to contaminant ingress, high cycle wear and thermal fluctuations. Benefits include reduced downtime, extended seal life, lower energy loss and smoother cylinder operation—translating into measurable savings on maintenance and total cost of ownership.

Ordering, Support and Custom Solutions

With fast prototyping and responsive technical support, Polypac provides tailored piston seal for excavator cylinder solutions, drawing on our sealing material development and custom O-ring production expertise. Contact Polypac for application assessment, material recommendations and turnkey sealing programs to boost your hydraulic reliability.

piston seal for excavator cylinder Display

FAQ:

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.

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 do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

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.

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.

Table of Contents

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Piston Seal for Excavator Cylinder by Polypac
Overview
Why Choose Polypac Piston Seals
Materials and Customization
Manufacturing and Quality Assurance
Applications and Performance Benefits
Ordering, Support and Custom Solutions
piston seal for excavator cylinder Display

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