dbde24e1-4012-47b6-8db4-e89ee4ca5a70 - Polypac

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Polypac Rod Seal for Excavator Hydraulic — Reliable, Long-Life Seal

High-performance Polypac rod seal for excavator hydraulic systems. Made from PTFE-filled composites and premium elastomers, it resists wear, heat, and chemicals. Custom sizes and testing-backed quality reduce leaks and downtime.

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Product Description

Polypac Rod Seal for Excavator Hydraulic

Polypac's Rod Seal for Excavator Hydraulic applications delivers dependable sealing where it matters most. Designed for heavy-duty excavators, our rod seals prevent hydraulic fluid leakage, resist abrasion, and stand up to extreme temperatures and contaminants — keeping your equipment productive and lowering maintenance costs.

Key Features

Precision fit to minimize leakage and rod wear
High abrasion and extrusion resistance for long service life
Stable performance across wide temperature ranges
Compatible with common hydraulic fluids and additives

Materials & Options

Polypac offers rod seals in PTFE-filled composites (bronze, carbon, graphite, MoS₂, glass) and elastomers like NBR, FKM, EPDM, silicone, and FFKM. Our extensive material range ensures the right balance of friction, wear resistance, and sealing performance for your specific excavator rod seal needs.

Benefits for Your Excavator

Reduced hydraulic leaks — lower downtime and fluid loss
Improved rod protection — fewer rod scratches and scoring
Longer maintenance intervals — lower total cost of ownership
Customizable for special working conditions (abrasive, high temp, contaminated environments)

Why Choose Polypac

Founded in 2008, Polypac is a scientific and technical hydraulic seal manufacturer. Our factory spans over 10,000 m² with 8,000 m² of production space and advanced testing equipment. We originated with filled PTFE sealing materials and now supply a full range of O-rings and seals. Long-term partnerships with universities and research institutes ensure our hydraulic rod seal products meet rigorous quality and performance standards.

Ordering & Customization

Need a specific size or material? Polypac provides custom rod seal solutions for special working conditions and OEM specifications. Send drawings, dimensions, or operating details — we offer samples, material recommendations, and testing reports to support your selection.

Contact Polypac today to get a durable, high-performance rod seal for excavator hydraulic systems that reduces leaks and extends equipment life.

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Frequently Asked Questions

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.

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.

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.

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