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PTFE/PU Composite Seal — High-Performance Sealing Solutions by Polypac

PTFE/PU Composite Seal — Reliable, Low-Friction Hydraulic Sealing

Overview

Polypac's PTFE/PU Composite Seal combines the chemical inertness and low friction of filled PTFE with the elastic recovery and extrusion resistance of polyurethane (PU) to deliver a robust sealing solution for demanding hydraulic and industrial applications. The PTFE/PU Composite Seal is engineered to reduce wear, extend service intervals, and improve system efficiency while maintaining dependable sealing under variable pressures and temperatures.

Performance & Materials

The composite construction pairs a precision-molded PTFE sliding surface—available in bronze-filled, carbon-filled, graphite, MoS₂-filled, or glass-filled formulations—with a resilient PU energizer. This hybrid design gives the PTFE/PU Composite Seal excellent frictional behavior, strong resistance to abrasive media, and superior extrusion prevention. Typical benefits include low breakaway torque, reduced heat generation, and extended lifespan compared with conventional single-material seals.

Applications & Compatibility

Designed for hydraulic cylinders, actuators, pumps, and high-cycle equipment, the PTFE/PU Composite Seal performs reliably in mobile hydraulics, industrial presses, and marine systems. It is compatible with common mineral oils, HLP, HETG, and many synthetic fluids; material selection can be tailored for specialty fluids and extreme temperature ranges, ensuring optimal compatibility and sealing performance.

Customization & Quality Assurance

Founded in 2008, Polypac combines large-scale manufacturing capacity with advanced testing capabilities and ongoing collaboration with universities and research institutions. Our factory spans over 10,000 m², and we offer custom sizes, tolerances, and filled PTFE formulations to meet unique operating conditions. Every PTFE/PU Composite Seal undergoes precision inspection and performance validation to meet your required specifications.

Why Choose Polypac

Selecting Polypac means partnering with an award-winning seal manufacturer committed to innovation, consistency, and service. Whether you need standard PTFE/PU Composite Seals or bespoke solutions for extreme environments, our R&D-driven approach and industry-leading production ensure reliable sealing performance and measurable lifecycle cost savings.

PTFE/PU Composite Seal Display

FAQ:

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.

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 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.

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.

Table of Contents

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PTFE/PU Composite Seal — Reliable, Low-Friction Hydraulic Sealing
Overview
Performance & Materials
Applications & Compatibility
Customization & Quality Assurance
Why Choose Polypac
PTFE/PU Composite Seal Display

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