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Polypac Rod Seals for Hydraulic Cylinders — Precision Sealing Solutions

Polypac Rod Seals for Hydraulic Cylinders — Precision Sealing Solutions

Expertise & Capacity

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier specializing in seal production, sealing material development, and customized sealing solutions. Founded in 2008, our custom rubber ring and O-ring factory occupies over 10,000 m² with 8,000 m² of production space. We leverage advanced production and testing equipment and long-term partnerships with universities and research institutes to deliver rod seals for hydraulic cylinders with consistent quality and traceability.

Advanced Materials & Performance

We pioneered filled PTFE seals—bronze, carbon, graphite, MoS₂ and glass filled—offering low friction, high wear resistance and excellent extrusion protection. For rod seals for hydraulic cylinders, Polypac also supplies elastomers including NBR, FKM, silicone, EPDM and FFKM to meet temperature, chemical and dynamic sealing requirements. Material selection is optimized for friction, sealing reliability and service life in both mobile and industrial hydraulics.

Custom Design & Rigorous Testing

Polypac provides tailored rod seal for hydraulic cylinders designs to suit pressure, speed, temperature and contamination conditions. Our in-house prototyping and testing capabilities include dynamic testing, dimensional inspection and material certification. We validate seals against customer specifications and international standards to ensure leak-free performance under real-world conditions.

Applications & Customer Benefits

Our rod seals serve construction machinery, agricultural equipment, mining, oil & gas, and industrial hydraulic systems. Key benefits include reduced leakage, extended service intervals, lower energy loss from friction, and improved reliability in harsh or contaminated environments. Polypac’s solutions help customers cut maintenance costs and maximize uptime.

Why Choose Polypac

As one of China’s largest dedicated seal developers, Polypac combines scale, R&D depth and fast customization. From prototype to volume production, we ensure competitive lead times, strict quality control and global logistics. Contact Polypac to specify rod seals for hydraulic cylinders tailored to your application and receive expert material recommendations, samples and testing support.

rod seals for hydraulic cylinders Display

FAQ:

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.

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.

Table of Contents

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Polypac Rod Seals for Hydraulic Cylinders — Precision Sealing Solutions
Expertise & Capacity
Advanced Materials & Performance
Custom Design & Rigorous Testing
Applications & Customer Benefits
Why Choose Polypac
rod seals for hydraulic cylinders Display

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