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Polypac Polyurethane O-Rings — Durable, High-Performance Seals

Polyurethane O-Rings by Polypac: Rugged Sealing for Demanding Applications

Overview

Polypac Polyurethane O-Rings are engineered for environments where abrasion resistance, tear strength, and dynamic performance are critical. As a scientific and technical hydraulic seal manufacturer, Polypac blends decades of material expertise with precision production to deliver O-rings that maintain sealing integrity under high pressures, repeated cycles, and abrasive media.

Materials & Performance

Polyurethane O-Rings offer superior resilience compared to general-purpose elastomers. Our formulations prioritize cut and abrasion resistance, compression set stability, and compatibility with hydraulic oils and lubricants. Polypac optimizes polymer grades and additives to balance hardness, flexibility, and chemical resistance for application-specific performance.

Custom Manufacturing & Quality Control

Polypac’s custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space and industry-leading equipment. Founded in 2008, we evolved from filled PTFE expertise to a broad elastomer portfolio including NBR, FKM, silicone, EPDM, FFKM, and polyurethane. Rigorous testing protocols and partnerships with universities and research institutes ensure each Polyurethane O-Ring batch meets tight tolerances and long-term reliability requirements.

Typical Applications

Polyurethane O-Rings are ideal for hydraulic cylinders, high-speed rotary axis seals, mobile equipment, and oil-sealed assemblies where abrasion and extrusion resistance are paramount. They excel in construction machinery, agricultural hydraulics, industrial pumps, and compressors that demand long cycle life and minimal maintenance downtime.

Why Choose Polypac

Polypac combines advanced materials science with tailored sealing solutions for special working conditions. We offer design support, custom sizes, rapid prototyping, and volume production with consistent quality. Choose Polypac Polyurethane O-Rings for dependable sealing performance, optimized life-cycle cost, and trusted technical support from one of China’s largest dedicated seal manufacturers.

Get Started

Contact Polypac to specify material grade, durometer, and dimensional tolerances for your Polyurethane O-Rings. Our team will recommend the best compound and processing route to meet your operational demands and regulatory needs.

Polyurethane O-Rings Display

FAQ:

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.

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.

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 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.

Table of Contents

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Polyurethane O-Rings by Polypac: Rugged Sealing for Demanding Applications
Overview
Materials & Performance
Custom Manufacturing & Quality Control
Typical Applications
Why Choose Polypac
Get Started
Polyurethane O-Rings Display

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