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Polypac POM Backup Rings — Reliable Hydraulic Seal Solutions

Polypac POM Backup Rings — Product Category Overview

What are POM Backup Rings?

POM Backup Rings are precision-molded support rings made from polyoxymethylene (acetal) designed to prevent extrusion of elastomeric O-rings in high-pressure or dynamic hydraulic systems. Polypac manufactures POM Backup Rings to tight tolerances for consistent sealing performance across a wide range of temperatures and media.

Key Features

Polypac POM Backup Rings offer excellent dimensional stability, low wear, and chemical resistance. Their low friction surface reduces heat generation and minimizes wear on mating surfaces. Available in standard and custom profiles, these backup rings complement NBR, FKM, EPDM, silicone, and FFKM O-rings for enhanced reliability.

Materials and Manufacturing Excellence

Manufactured in our 10,000+ m² facility with 8,000 m² of dedicated factory space, Polypac uses advanced processing and inspection equipment to produce high-quality POM Backup Rings. Our materials selection balances strength and flexibility, with strict quality control and collaborations with universities and research institutes to optimize performance.

Applications

POM Backup Rings are ideal for hydraulic cylinders, valves, pumps, and mobile equipment exposed to high pressure, aggressive fluids, or temperature cycling. They prevent seal extrusion in tight clearances and are suitable for both static and reciprocating applications in industrial, automotive, and aerospace environments.

Customization and Testing

Polypac provides bespoke POM Backup Rings tailored to special working conditions — from unique geometries to compound adjustments. Our in-house testing capabilities ensure each batch meets durability, dimensional, and chemical-resistance specifications before delivery.

Why Choose Polypac

As a scientific and technical hydraulic seal manufacturer, Polypac blends decades of sealing expertise with modern production to deliver dependable POM Backup Rings. Our full product range — including PTFE-filled seals and multi-material O-rings — plus responsive technical support, ensures the optimal sealing solution for your application.

Ordering and Support

Contact Polypac for samples, CAD drawings, and material recommendations. Our experienced team will help specify the right POM Backup Rings and integration guidance to extend seal life and reduce maintenance costs.

POM Backup Rings Display

FAQ:

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.

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.

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

Table of Contents

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Polypac POM Backup Rings — Product Category Overview
What are POM Backup Rings?
Key Features
Materials and Manufacturing Excellence
Applications
Customization and Testing
Why Choose Polypac
Ordering and Support
POM Backup Rings Display

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