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

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KZT Guide & Seal Elements Integrated Low-Friction Guidance and Reliable Sealing (6) - Polypac

Polypac Seal with Backup Ring

Polypac Seal with Backup Ring delivers reliable anti-extrusion protection for hydraulic and pneumatic systems. Made from advanced materials and backed by rigorous testing, it ensures long service life and customizable fit for demanding conditions.

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Product Information

Product Overview

The Polypac Seal with Backup Ring is designed to prevent O-ring extrusion in high-pressure and dynamic applications. Combining a flexible sealing element with a robust backup ring, it provides a dependable seal for hydraulic cylinders, valves, pumps, and other equipment. Built from high-quality materials and manufactured in our advanced facility, this seal offers superior durability and consistent performance.

Key Features

Anti-extrusion protection: Backup ring supports the O-ring under pressure to prevent deformation and leakage.
Material versatility: Available in PTFE-filled variants and elastomers such as NBR, FKM, silicone, EPDM and FFKM to suit temperature and chemical needs.
Precision manufacturing: Produced in our 8,000 m² factory with modern equipment for tight tolerances and reliable fit.
Customizable: Tailored sizes and material combinations for special working conditions and OEM specifications.
Tested for quality: Rigorous inspection and performance testing ensure long-term stability and low failure rates.

Benefits for Your Equipment

Using a Polypac Seal with Backup Ring reduces maintenance frequency and downtime by extending seal life and maintaining system pressure. The backup ring minimizes extrusion and protects the primary seal during pressure spikes or rapid movement. This results in better equipment reliability and lower total cost of ownership.

Applications

Ideal for hydraulic and pneumatic systems, agricultural machinery, construction equipment, oil & gas tools, and industrial valves. Particularly effective in high-pressure, reciprocating, or oscillating environments where extrusion risk is high.

Why Choose Polypac

Founded in 2008, Polypac combines deep material expertise with close collaboration with universities and research institutes. Our large production footprint and advanced testing capabilities make us a trusted partner for customized sealing solutions. From filled PTFE seals to a wide range of O-ring materials, Polypac delivers performance you can rely on.

Contact Polypac today to specify the right Seal with Backup Ring for your application and get a quotation tailored to your needs.

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Q&A

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.

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.

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.

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.

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PRODUCTS

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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