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

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Polypac Hydraulic Seal Kit — Reliable Hydraulic Seals & O-rings

Polypac Hydraulic Seal Kit delivers durable hydraulic seals and O-rings made from PTFE, NBR, FKM and custom compounds. Precision-made in China with advanced testing, customizable solutions for demanding conditions and long-term support.

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Product Information

Product Overview

Polypac Hydraulic Seal Kit provides a complete set of high-performance hydraulic seals designed for durability and reliable operation. Each kit includes piston seals, rod seals, wipers, backup rings and O-rings sized for your system. Built for easy installation and long service life, our kits reduce downtime and maintenance costs.

What’s in the Kit

The Hydraulic Seal Kit contains:

Piston seals and rod seals
O-rings and custom rubber rings
Backup rings and dust wipers
Instruction sheet for installation

All components are available in common materials like NBR, FKM, EPDM and advanced PTFE compounds, and can be customized for special working conditions.

Key Features & Benefits

Reliable sealing: Precision-molded seals prevent leaks and maintain pressure.
Long life: Filled PTFE options (bronze, carbon, MoS₂, graphite, glass) reduce wear in harsh environments.
Easy maintenance: Complete kit includes everything needed for a service job.
Wide compatibility: Fits most hydraulic cylinders and systems.
Custom solutions: Tailored materials and sizes for high temperature, chemical exposure, or abrasive media.

Materials & Quality Assurance

Polypac began in 2008 with filled PTFE seals and has expanded to O-rings in NBR, FKM, silicone, EPDM and FFKM. Our factory spans over 10,000 m² with 8,000 m² production space and advanced production and testing equipment. We work closely with universities and research institutes to ensure material performance and product reliability.

Applications

Ideal for hydraulic cylinders in construction machinery, industrial presses, mobile equipment, oil & gas, and other demanding industries where leak-free operation matters.

Why Choose Polypac

As a scientific and technical hydraulic seal manufacturer and oil seal supplier, Polypac offers expert sealing material development and customization. Our Hydraulic Seal Kit combines proven materials, strict testing, and flexible customization to meet your needs. Choose Polypac for precision-made hydraulic seals that protect your equipment and keep systems running.

For custom kits or technical support, contact Polypac to discuss your application and get a tailored sealing solution.

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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.

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.

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.

Let's talk

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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