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

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Polypac Piston Seal with Backup Ring

Polypac Piston Seal with Backup Ring delivers reliable, low-friction sealing for hydraulic cylinders. Built to resist extrusion and leakage, available in PTFE and elastomer combinations, and customizable for demanding working conditions.

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Product Description

Overview

The Polypac Piston Seal with Backup Ring is a high-performance sealing solution designed for hydraulic and pneumatic cylinders. Combining a flexible piston seal with a supportive backup ring, this assembly prevents extrusion, reduces leakage, and extends service life under high pressure and repeated cycling.

Key Features

Durable and Reliable

Engineered from proven materials such as PTFE-filled compounds and compatible elastomers (NBR, FKM, EPDM, silicone, FFKM), the piston seal offers low friction and excellent wear resistance. The backup ring adds structural support at high pressures to block extrusion into the clearances.

Precision Manufacturing

Polypac manufactures seals in a modern 10,000+ sq. meter facility with advanced production and testing equipment. Each piston seal and backup ring is produced to tight tolerances for consistent performance and interchangeability.

Materials & Options

Available materials include bronze-filled, carbon-filled, graphite PTFE, MoS₂-filled PTFE and glass-filled PTFE for demanding friction and temperature requirements. Elastomer choices such as NBR, FKM and FFKM make the seal suitable for a wide range of fluids and temperatures. Custom sizes and material blends can be developed for special working conditions.

Applications

Ideal for hydraulic cylinders in construction equipment, industrial presses, mobile machinery, marine systems and other heavy-duty applications. The piston seal with backup ring is especially effective where high pressure, rapid cycling, or larger clearance gaps increase the risk of seal extrusion.

Why Choose Polypac

Founded in 2008, Polypac combines decades of sealing expertise with ongoing research collaborations with universities and institutes. As one of China’s leading seal manufacturers, Polypac offers reliable quality control, fast customization, and a full range of sealing materials. Our commitment to testing and material development ensures seals that perform consistently and give long service life.

Benefits at a Glance

Excellent extrusion resistance and low leakage
Low friction for smooth cylinder movement
Wide material choices for different fluids and temperatures
Custom sizes and rapid production capability
Trusted manufacturing and testing standards

Contact Polypac to specify the right piston seal with backup ring for your hydraulic application and get a durable, tested sealing solution tailored to your needs.

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Q&A

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.

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 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 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.

If you have any questions or concern, please contact us.

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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.

DAQ Series Piston Seal | Urethane U-Cup Kit for Heavy-Duty Applications

Polypac’s DAQ Series Piston Seal Kit features durable urethane U-cups with backup rings, designed for heavy-duty applications. Ideal for metric piston seal kits, it ensures optimal sealing performance and long-lasting reliability in demanding industrial environments.

DAQ Series Piston Seal | Urethane U-Cup Kit for Heavy-Duty Applications