Polypac Piston Seal for Excavator Cylinder

Polypac piston seals for excavator cylinders deliver durable, leak-proof performance under high pressure and harsh conditions. Custom materials and precise manufacturing ensure long life and reliable hydraulic operation.

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Product Details

Overview

Polypac piston seals for excavator cylinders are engineered to keep your heavy equipment running reliably. Designed for high-pressure hydraulic systems, these seals prevent leakage, reduce maintenance, and extend cylinder life. Polypac combines advanced materials with strict quality control to deliver consistent performance in harsh environments.

Key Features and Benefits

High pressure resistance — Maintains seal under heavy loads and repeated cycles.
Excellent wear resistance — Reduces downtime and replacement frequency.
Low friction — Improves cylinder efficiency and lowers operating temperature.
Leak-proof performance — Ensures reliable hydraulics for safety and productivity.
Customizable — Materials and dimensions adapted for special working conditions.

Material Options

Polypac offers a wide range of materials to match your application: filled PTFE (bronze, carbon, graphite, MoS₂, glass), and elastomers such as NBR, FKM, silicone, EPDM, and FFKM. This flexibility lets you choose the best balance of sealing, wear resistance, and chemical compatibility.

Technical Quality

Our factory covers over 10,000 m² with 8,000 m² of production space and industry-leading testing equipment. Each piston seal goes through strict inspection to meet performance standards. Polypac’s long-standing partnerships with universities and research institutes ensure up-to-date material development and testing methods.

Applications

Ideal for excavators, loaders, and other heavy construction machinery, Polypac piston seals are made for demanding tasks like digging, lifting, and continuous operation in abrasive or wet conditions.

Why Choose Polypac

Founded in 2008, Polypac is a scientific and technical hydraulic seal manufacturer. With experience in filled PTFE technologies and a broad elastomer product line, we deliver reliable, tested seals and customized solutions. Our focus on material science and precision manufacturing gives you confidence in long-term performance.

Ordering and Customization

Need a custom size or special material for extreme conditions? Contact Polypac for tailored piston seals, fast quotes, and technical support. We provide samples, testing data, and volume production to meet your project timeline.

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Q&A

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 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.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

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.

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