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

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

Polypac PTFE/PU Composite Seal combines a low-friction PTFE sliding surface with a tough PU supporting layer for superior wear resistance, low leakage, and long service life. Ideal for hydraulic cylinders and demanding environments. Custom sizes available.

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Product Description

Polypac PTFE/PU Composite Seal — Overview

Polypac's PTFE/PU Composite Seal pairs a filled PTFE sliding lip with a polyurethane (PU) backing to deliver smooth movement, excellent sealing, and strong support under pressure. Designed for hydraulic cylinders, heavy machinery, and industrial equipment, this composite seal offers reliable performance in tough conditions.

Features & Benefits

Low friction and smooth operation

The PTFE surface reduces friction and stick-slip, improving responsiveness and extending component life.

High wear and extrusion resistance

The PU backing provides toughness and resilience, preventing extrusion and maintaining sealing under high pressure.

Chemical and temperature resilience

Filled PTFE resists many chemicals and operates over a wide temperature range, while PU maintains mechanical strength for reliable sealing.

Low leakage and long service life

Optimized geometry and material pairing reduce leakage, lower maintenance needs, and extend time between service intervals.

Customizable and precision-made

Polypac offers custom sizes, profiles, and material fills to match specific working conditions and customer requirements.

Applications

Hydraulic cylinders and pistons
Mobile and industrial machinery
High-pressure hydraulic systems
Valves and actuators
Equipment operating in abrasive or chemically aggressive environments

Why Choose Polypac

Founded in 2008, Polypac is a scientific and technical hydraulic seal manufacturer with over 10,000 m² of production area and advanced testing equipment. We started with specialty PTFE seals—bronze, carbon, graphite, MoS₂ and glass-filled PTFE—and now supply a broad range including NBR, FKM, silicone, EPDM and FFKM O-rings. Our long-term partnerships with universities and research institutes ensure continuous material and design improvements.

Polypac provides reliable customer support, fast customization, and quality manufacturing. If you need a durable, low-friction seal that performs in demanding conditions, the PTFE/PU Composite Seal is a cost-effective solution that reduces downtime and improves system efficiency.

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Question you may concern

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 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.

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.

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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