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

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Polypac Cylinder Seal — Durable Hydraulic Cylinder Seals

Polypac Cylinder Seal offers reliable hydraulic sealing with advanced PTFE and elastomer materials, custom sizes, and thorough testing to prevent leakage and extend equipment life.

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Product Description

Polypac Cylinder Seal — Reliable sealing for hydraulic cylinders

Polypac Cylinder Seals are engineered to deliver dependable sealing performance in hydraulic cylinders, heavy machinery, and industrial equipment. Backed by Polypac’s 15+ years of experience in PTFE and elastomer seal manufacturing, these seals reduce leakage, extend service life, and work well in demanding environments.

Why choose Polypac Cylinder Seals?

High-quality materials: available in bronze-filled, carbon-filled, graphite, MoS₂, glass-filled PTFE, and elastomers like NBR, FKM, EPDM, silicone, and FFKM.
Custom solutions: tailored sizes and compound choices for special pressures, temperatures, and chemical exposure.
Advanced production: manufactured in a 10,000+ m² facility with modern testing and quality control equipment.
Proven expertise: long-term collaboration with universities and research labs ensures continuous improvement.

Practical benefits

Our Cylinder Seals provide tight sealing to prevent oil loss and contamination, reduce maintenance frequency, and improve machine uptime. They resist abrasion, compression set, and many chemicals — making them a cost-effective choice for mobile hydraulics, construction equipment, presses, and marine systems.

Applications and performance

Polypac Cylinder Seals suit a wide range of applications: hydraulic cylinders, piston rods, jacks, and actuators. Choose PTFE-filled options for low friction and high wear resistance, or select elastomers like FKM and FFKM when chemical and high-temperature resistance is required. We test for pressure, temperature cycles, and durability to ensure consistent field performance.

Quality assurance and customization

Every seal goes through strict inspection and testing. Our R&D team can develop custom compounds and profiles for unique working conditions. From prototype to mass production, Polypac delivers fast sampling, clear documentation, and responsive technical support.

Contact Polypac today for a custom quote or technical consultation and protect your equipment with cylinder seals designed for real-world performance.

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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.

How do I choose the right material for my sealing application?

Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

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.

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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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