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

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Polypac Construction Machinery Seal Kit

Polypac Construction Machinery Seal Kit offers reliable hydraulic sealing for excavators, loaders and cranes. Made with premium materials, strict testing and customizable options for long service life.

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Product Information

Product Overview

Polypac Construction Machinery Seal Kit is designed to keep hydraulic systems on excavators, loaders, cranes and other heavy equipment performing reliably. Each kit includes a selection of PTFE-filled seals, oil seals, O-rings and backup rings chosen to resist abrasion, pressure and harsh working conditions common on construction sites.

Key Features

Durable materials: PTFE variants, NBR, FKM, EPDM, silicone and FFKM available.
Complete sets: seals, O-rings, dust wipers and backup rings for straightforward replacement.
High precision: tight tolerances for better sealing and longer life.
Easy installation: designed to fit common construction machinery models.

Materials & Compatibility

Polypac began with filled PTFE seals and expanded to a wide range of elastomers. Choose bronze-filled, carbon-filled, graphite or MoS₂-filled PTFE for sliding parts, and select NBR, FKM or EPDM for static and dynamic sealing. Our kits are compatible with standard hydraulic fluids and most construction equipment brands.

Applications

These seal kits are ideal for hydraulic cylinders, pumps and motors used in excavators, backhoes, wheel loaders, cranes, compactors and other heavy machinery. They are built to withstand dirt, shock loads, varying temperatures and continuous operation on job sites.

Why Choose Polypac

Polypac is a trusted manufacturer with a 10,000 m² facility and advanced production and testing equipment. Since 2008 we have worked with universities and research centers to develop reliable sealing solutions. Our focus on material science and quality control ensures each kit reduces downtime and maintenance cost.

Testing & Quality

Every kit undergoes dimensional checks, material verification and performance testing to ensure consistent sealing under pressure and temperature changes. We provide traceability and can supply test reports on request.

Ordering & Customization

Polypac offers standard kits and custom solutions for special working conditions. Contact us with your machine model or dimensions and we will recommend the optimal kit or design a custom sealing solution.

Detailed display

Q&A

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 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.

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 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.

If you have any other questions, please write email to us or call us , we will reply you as soon as possible.

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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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