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Polypac Servo Cylinder Seals — Precision for High‑Performance Hydraulic Motion

Servo Cylinder Seals by Polypac — Precision for Motion Control

Performance and Applications

Servo Cylinder Seals from Polypac are engineered for accuracy, low friction and long life in servo-driven hydraulic cylinders. Ideal for robotics, aerospace actuators, injection molding machines and industrial automation, our seals maintain tight control of pressure, reduce hysteresis and improve positional repeatability in demanding motion-control environments.

Materials Tailored to Your Needs

We offer a broad range of sealing compounds including bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS₂-filled PTFE, glass-filled PTFE, and elastomers such as NBR, FKM, silicone, EPDM and FFKM. By selecting the right material pairing for temperature, chemical exposure and friction requirements, Polypac optimizes seal life and system performance for each servo cylinder design.

Advanced Manufacturing & Customization

Polypac’s custom rubber ring and O-ring factory spans more than 10,000 m² with 8,000 m² of production space. Using industry-leading production and testing equipment, we offer tailored geometries, compound formulations, and precision machining to meet tight tolerances and unique installation constraints. From prototype to volume production, our team delivers scalable solutions for special working conditions.

Quality Assurance & R&D Collaboration

Founded in 2008, Polypac combines decades of sealing expertise with ongoing R&D. We maintain long-term collaborations with universities and research institutes to validate materials and performance. Rigorous testing—wear, extrusion, pressure, and temperature cycles—ensures each Servo Cylinder Seal meets or exceeds reliability expectations for critical applications.

Why Choose Polypac

As one of China’s largest dedicated seal manufacturers, Polypac blends scientific rigor with practical experience. Our products reduce downtime, improve control precision, and lower total cost of ownership. For custom Servo Cylinder Seals that balance friction, durability and sealing integrity, contact Polypac for consultation, samples and design support.

Servo Cylinder Seals Display

FAQ:

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

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 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.

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.

Table of Contents

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Servo Cylinder Seals by Polypac — Precision for Motion Control
Performance and Applications
Materials Tailored to Your Needs
Advanced Manufacturing & Customization
Quality Assurance & R&D Collaboration
Why Choose Polypac
Servo Cylinder Seals Display

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