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

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Polypac Heavy Duty Rod Seal

Polypac Heavy Duty Rod Seal delivers reliable hydraulic sealing for high-load, harsh environments. Engineered for low friction, long life, and wide chemical compatibility. Manufactured with advanced processes and strict quality control.

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Product Information

Product Overview

Polypac Heavy Duty Rod Seal is designed to provide dependable sealing for hydraulic cylinders operating under high loads and tough conditions. Built from advanced materials and produced in our modern 10,000+ m2 facility, this rod seal offers consistent performance, long service life, and easy installation for OEMs and maintenance teams alike.

Key Features

High load capacity and excellent wear resistance for prolonged life
Low friction design to reduce stick-slip and improve system efficiency
Wide temperature and chemical compatibility for versatile use
Precision manufacturing and strict quality testing for reliable performance

Materials & Compatibility

Polypac offers Heavy Duty Rod Seals in a range of proven materials, including filled PTFE variants and elastomers such as NBR, FKM, EPDM, and custom compounds. This allows selection based on fluid type, temperature, and wear requirements. Our original expertise in bronze-, carbon-, and MoS₂-filled PTFE ensures excellent friction control and abrasion resistance.

Typical Applications

Ideal for hydraulic cylinders in construction equipment, mining machinery, forklifts, agricultural implements, and industrial presses. The seal is suitable for both new machines and retrofit repairs where durability and leak prevention are critical.

Why Choose Polypac

Founded in 2008, Polypac combines scientific research with advanced production. Our 8,000 m2 factory, industry-leading production and testing equipment, and partnerships with universities ensure continuous material and product improvement. We provide customized sealing solutions for special working conditions and offer reliable support from design to delivery.

Installation & Maintenance Tips

Install seals on clean, undamaged rods and housings. Use proper lubrication during assembly and inspect seals regularly for wear or extrusion. Our technical team can advise on the best material and geometries for your application.

Polypac Heavy Duty Rod Seal gives you confidence in performance and longevity. Contact us for material options, custom sizes, and testing data to match your equipment needs.

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Question you may concern

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.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

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 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.

About other questions pls contact me directily.

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PRODUCTS

dbde24e1-4012-47b6-8db4-e89ee4ca5a70

Polypac Industrial Technology Co.,Ltd

+86 189 2463 6168

rose@dmsseals.com

No. 5, Hegui Mid Road, Hegui Industrial Park, Lishui Town, Nanhai District, Foshan City, Guangdong Province, P.R. China.

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