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Polypac O-Ring Backup Rings — Reliable Anti-Extrusion Support

Polypac O-Ring Backup Rings provide reliable anti-extrusion support for O-rings in high-pressure and demanding environments. Made from advanced materials with strict quality control and customization available.

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Product Information

Polypac O-Ring Backup Rings — Built for Reliability

Polypac O-Ring Backup Rings are designed to protect O-rings from extrusion and deformation under high pressure, temperature changes, and harsh operating conditions. Backed by Polypac’s decades of sealing expertise and advanced production facilities, our backup rings deliver consistent performance for hydraulic, pneumatic, and industrial applications.

Key Benefits

Prevents O-ring extrusion at high pressures
Extends seal life and reduces maintenance
Stable across wide temperature and chemical ranges
Available in multiple materials and sizes for fast fit

Materials and Options

We offer backup rings in PTFE and filled PTFE, plus harder polymer options tailored to your needs. Common materials include:

PTFE and filled PTFE (bronze, carbon, graphite, MoS₂, glass) — excellent chemical resistance and low friction
High-performance elastomers compatible with NBR, FKM, silicone, EPDM, and FFKM O-rings

Applications

Polypac backup rings are ideal for hydraulic cylinders, valves, pumps, and any system where O-rings face extrusion risk. They are used in oil & gas, heavy machinery, automotive, and industrial equipment.

Why Choose Polypac?

Founded in 2008, Polypac combines scientific research and practical manufacturing. Our custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space. We use advanced production and testing equipment and maintain ongoing partnerships with universities and research institutes. This means every backup ring is produced under strict quality control and can be customized for special working conditions.

Quality & Customization

We provide material selection guidance, dimensional customization, and batch testing to ensure compatibility with your systems. Whether you need standard sizes or bespoke designs for extreme environments, Polypac delivers reliable, long-lasting backup rings.

Contact Polypac for technical support and fast quotes. Protect your O-rings and improve system reliability with Polypac O-Ring Backup Rings.

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Frequently Asked Questions

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 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.

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.

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

Let's talk

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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