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Polypac: Zero Leakage Hydraulic Seals for Critical Applications

Polypac: Zero Leakage Hydraulic Seals for Critical Applications

About Polypac: Science-Driven Seal Manufacturing

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier focused on delivering Zero Leakage performance. Founded in 2008, we began with filled PTFE seals and expanded to a full portfolio of O-rings and rubber rings in NBR, FKM, EPDM, silicone and FFKM. Our 10,000+ m2 facilities and advanced production equipment support consistent quality and fast turnarounds for tailored sealing solutions.

Materials & Customization for Zero Leakage

To achieve Zero Leakage, material selection and compound engineering are critical. Polypac develops and manufactures bronze-, carbon-, graphite-, MoS₂-, and glass-filled PTFE, plus high-performance elastomers. We collaborate with universities and research institutions to optimize friction, wear and chemical resistance. Custom formulations and precision molding let us meet unique pressures, temperatures and media with minimal leakage.

Advanced Production & Rigorous Testing

Our factory space of 8,000 m2 houses industry-leading production and testing equipment. Every seal undergoes dimensional verification, material analysis and performance testing under simulated working conditions. That rigorous QA ensures each component performs reliably in static and dynamic applications, delivering the Zero Leakage outcomes our clients demand.

Applications Where Zero Leakage Matters

Polypac seals are engineered for hydraulic systems, pumps, valves, automotive, aerospace, oil & gas and industrial machinery. Whether you need a low-friction PTFE piston seal, a chemical-resistant FFKM O-ring, or a custom rubber ring for extreme conditions, our products minimize downtime and maintenance with proven sealing integrity.

Why Choose Polypac & Get Started

As one of China’s largest dedicated seal manufacturers, Polypac combines material expertise, scalable manufacturing and academic partnerships to deliver measurable Zero Leakage performance. Contact us for samples, material data sheets and custom design support—engineered sealing solutions that protect your systems and improve reliability.

Zero Leakage Display

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.

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

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: Zero Leakage Hydraulic Seals for Critical Applications
About Polypac: Science-Driven Seal Manufacturing
Materials & Customization for Zero Leakage
Advanced Production & Rigorous Testing
Applications Where Zero Leakage Matters
Why Choose Polypac & Get Started
Zero Leakage Display

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