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

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Polypac Hydraulic Cylinder Seal Kit

Polypac Hydraulic Cylinder Seal Kit delivers reliable, long-lasting sealing for hydraulic cylinders. Easy to install, available in multiple materials, and built for harsh working conditions. Trusted manufacturing and customization since 2008.

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Product Information

Polypac Hydraulic Cylinder Seal Kit

Polypac Hydraulic Cylinder Seal Kit provides a complete set of precision-engineered seals for maintenance and rebuilds. Each kit includes rod seals, piston seals, wipers, guide rings, backup rings and O-rings selected for optimal fit and performance. Designed for durability and easy installation, our kits reduce downtime and extend cylinder life.

Key Features

Complete kit: all common sealing components supplied together for quick replacement.
High durability: materials and assemblies resist wear, extrusion and chemical attack.
Easy installation: components sized for accurate fit and fast service.
Custom options: available for special diameters and extreme working conditions.

Materials & Compatibility

Polypac offers seals in a wide range of materials including PTFE (bronze, carbon, graphite, MoS₂, glass filled), NBR, FKM, EPDM, silicone and FFKM. This variety ensures compatibility with hydraulic oils, high pressures and different temperatures, giving you the right balance of sealing performance and longevity.

Applications & Benefits

Ideal for construction machinery, agricultural equipment, mining gear, hydraulic presses and industrial cylinders. Benefits include reduced leakage, improved efficiency, fewer service calls, and predictable maintenance scheduling. Whether you operate in cold climates, high temperatures or abrasive environments, Polypac kits are engineered to meet the challenge.

About Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier. Our factory spans over 10,000 m² with 8,000 m² of production space and advanced testing equipment. Founded in 2008, we began with filled PTFE seals and have expanded to a full range of O-rings and custom sealing solutions while working closely with universities and research institutions.

Why Choose Polypac

We combine proven materials, precise manufacturing and responsive customization. Choose Polypac Hydraulic Cylinder Seal Kit for reliable sealing, extended service life, and support from an experienced manufacturer. Contact us to select the right kit or request a custom solution for special working conditions.

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Q&A

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.

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.

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.

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.

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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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