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

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Polypac Pressure Balancing Seal

Polypac Pressure Balancing Seal delivers reliable, long-lasting sealing for hydraulic and oil systems. Custom materials and advanced testing ensure high performance and safety in demanding conditions.

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Product Description

Polypac Pressure Balancing Seal

Polypac Pressure Balancing Seal is designed to provide stable, leak-free performance in hydraulic and oil systems. Built for environments with fluctuating pressures and heavy loads, this seal balances internal and external forces to reduce extrusion and wear. It is easy to install, requires minimal maintenance, and extends service life compared with conventional seals.

Key Features

- Pressure-balanced design reduces seal extrusion and improves durability.
- Compatible with a wide range of materials including PTFE, NBR, FKM, EPDM and FFKM.
- Customizable sizes and profiles to fit special working conditions.
- Low friction surface for smooth operation and energy efficiency.
- Resistant to oils, fuels, and many hydraulic fluids.

Materials & Customization

Polypac began with filled PTFE solutions and now offers seals in many elastomers and compounded materials. We provide bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS₂-filled PTFE and glass-filled PTFE for demanding wear and temperature conditions. For rubber components, choose NBR, FKM, silicone, EPDM or high-performance FFKM. Our in-house development and a 10,000+ m² facility mean fast, reliable customization for special applications.

Applications

Ideal for hydraulic cylinders, pumps, valves and other oil-seal applications where pressure differentials are common. The Pressure Balancing Seal works well in mobile hydraulics, industrial machinery, and harsh environments where longevity and leak prevention are critical.

Quality & Reliability

Founded in 2008, Polypac combines advanced production equipment with long-term partnerships with universities and research institutes. Our rigorous testing ensures each seal meets performance standards. With a modern factory and experienced engineers, Polypac delivers consistent quality and on-time supply.

Why Choose Polypac?

Choose Polypac for proven sealing solutions, deep material expertise, and the ability to tailor seals to your needs. Our Pressure Balancing Seal gives you peace of mind through reliable performance, reduced downtime, and extended equipment life.

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Question you may concern

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.

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.

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

Get in Touch

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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