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Heavy Excavator Seal Solutions by Polypac

Robust Seals Built for Heavy Excavation

Heavy Excavator Seal assemblies from Polypac are engineered to withstand extreme pressures, abrasive soils, and continuous cyclic loads. Designed for boom, arm, bucket cylinders and swing drives, our seals deliver reliable performance across construction, mining, and infrastructure projects. With decades of sealing expertise, Polypac ensures each Heavy Excavator Seal minimizes leakage and maximizes operational uptime.

Advanced Materials for Maximum Durability

We utilize a broad portfolio of sealing materials—bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS2-filled PTFE, glass-filled PTFE—and elastomers including NBR, FKM, silicone, EPDM, and FFKM. These combinations provide superior wear resistance, low friction, wide temperature tolerance and enhanced chemical compatibility, ensuring your Heavy Excavator Seal performs in abrasive, oily, wet, or high-temperature environments.

Custom Manufacturing & Large-Scale Capacity

Polypac’s custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space and industry‑leading equipment. Since 2008 we’ve expanded from filled PTFE seals to a full range of hydraulic and oil seals. We offer tailored solutions—custom profiles, compound formulation, and rapid prototyping—to meet unique excavator specifications and special working conditions.

Rigorous Testing and Research Partnerships

Our production lines are paired with comprehensive testing capabilities to validate wear life, extrusion resistance, and leakage under simulated field conditions. Polypac maintains long-term collaborations with universities and research institutes domestically and internationally to drive continuous improvement and ensure every Heavy Excavator Seal meets stringent quality standards.

Applications, Benefits and Service

Polypac seals reduce downtime, lower maintenance costs, and extend component life across heavy equipment fleets. We provide technical support for selection, installation guidance, and aftermarket service. For OEMs and aftermarket distributors, our seals offer consistency, traceability, and scalable supply.

Why Choose Polypac

Choose Polypac for proven Heavy Excavator Seal performance backed by advanced materials science, customized manufacturing, and global technical support. Contact us for consultation, sample runs, and material certifications to match your most demanding sealing challenges.

Heavy Excavator Seal 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 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.

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.

Table of Contents

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Heavy Excavator Seal Solutions by Polypac
Robust Seals Built for Heavy Excavation
Advanced Materials for Maximum Durability
Custom Manufacturing & Large-Scale Capacity
Rigorous Testing and Research Partnerships
Applications, Benefits and Service
Why Choose Polypac
Heavy Excavator Seal Display

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