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

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Polypac Construction Machinery Seals

Construction Machinery Seals by Polypac

Polypac specializes in High Quality Construction Machinery Seals designed for the extreme demands of earthmoving, lifting and paving equipment. Combining decades of sealing expertise with advanced materials and precision manufacturing, Polypac seals provide reliable hydraulic and oil sealing solutions that reduce leaks, lower maintenance costs and extend component life.

Key Features

Our Construction Machinery Seals boast abrasion resistance, superior extrusion control and excellent wear life. These features make Polypac seals ideal for heavy-duty cylinders, motors and rotary joints where reliability under shock, dust and vibration is critical.

Advanced Materials and Options

Polypac offers a broad material portfolio including PTFE variants (bronze-filled, carbon-filled, MoS₂-filled, graphite and glass-filled), and elastomers such as NBR, FKM, EPDM, silicone and FFKM. This material range ensures optimized chemical compatibility, temperature tolerance and friction characteristics for each application.

Custom Solutions for Harsh Conditions

From custom O-rings to complex rubber ring geometries, Polypac provides tailored sealing solutions for special working conditions. Our R&D collaboration with universities and research institutes enables rapid prototyping and material development to meet unique site challenges.

Rigorous Testing and Large-Scale Capacity

With over 10,000 m² facility and 8,000 m² of factory space, Polypac combines industry-leading production equipment and comprehensive testing capabilities. Each batch of Construction Machinery Seals undergoes dimensional checks, material verification and performance testing to ensure consistent quality.

Applications and Benefits

Polypac seals are engineered for excavators, bulldozers, cranes, compactors and concrete machinery. Customers benefit from reduced downtime, longer service intervals and improved fuel efficiency thanks to lower internal leakage and optimized friction.

Why Choose Polypac

As a dedicated hydraulic seal manufacturer and oil seal supplier since 2008, Polypac merges scientific rigor with manufacturing scale. Choose Polypac for durable Construction Machinery Seals that deliver measurable uptime gains and long-term value.

Construction Machinery Seals Display

FAQ:

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.

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 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.

Table of Contents

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Construction Machinery Seals by Polypac
Key Features
Advanced Materials and Options
Custom Solutions for Harsh Conditions
Rigorous Testing and Large-Scale Capacity
Applications and Benefits
Why Choose Polypac
Construction Machinery Seals Display

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