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

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Polypac POM Backup Ring

Polypac POM Backup Ring provides reliable anti-extrusion protection, low friction and excellent wear resistance for hydraulic and pneumatic seals. Custom sizes and strict quality control ensure longer seal life and trouble-free operation.

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Product Information

Product Overview

Polypac POM Backup Ring is a precision-made anti-extrusion ring designed to protect O-rings and seals in high-pressure and dynamic environments. Made from engineering-grade POM (polyoxymethylene), this backup ring combines high stiffness with low friction to prevent seal extrusion, reduce wear and extend service life.

Key Features

High compressive strength and dimensional stability
Low friction surface for smooth sealing action
Excellent wear and chemical resistance in common hydraulic fluids
Available in standard and customized sizes for quick fit
Precision machining for tight tolerances and consistent performance

Benefits

Protects O-rings from extrusion under high pressure, reducing failures
Improves seal life and lowers maintenance and replacement costs
Easy to install and compatible with a wide range of seal materials
Stable performance in both static and dynamic applications

Applications

Ideal for hydraulic cylinders, valves, pumps and other oil and gas equipment, Polypac POM Backup Rings are perfect where anti-extrusion protection is needed. Suitable for both industrial and mobile hydraulics as well as many pneumatic systems.

Why Choose Polypac

Polypac is a specialist seal manufacturer and oil seal supplier with over a decade of focused experience. Our custom rubber ring and O-ring factory spans more than 10,000 m², supported by advanced production and testing equipment. We work closely with universities and research institutes to ensure continuous material and product improvement.

Customization & Quality

We offer custom sizes, tight tolerances and rapid prototyping to meet special working conditions. Every backup ring undergoes strict quality checks to ensure consistent performance. For tailored solutions or volume orders, contact our team for fast quotes and technical support.

Extend the life of your seals and reduce downtime with Polypac POM Backup Rings — reliable protection for demanding sealing applications.

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FAQ

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.

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.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

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.

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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.

DPT Piston Seal Kit | Bidirectional Seal with Anti-Extrusion Rings

The Polypac DPT Piston Seal Kit features a durable urethane piston seal paired with POM backup rings for superior bidirectional sealing and anti-extrusion protection. Ideal for high-performance hydraulic systems, ensuring long-lasting reliability and enhanced efficiency.

DPT Piston Seal Kit | Bidirectional Seal with Anti-Extrusion Rings