Urethane O-Rings by Polypac — High-Performance Polyurethane Seals
Polypac Urethane O-Rings — Durable, Precise, Proven
Polypac specializes in high-performance sealing solutions, and our Urethane O-Rings are engineered to meet the toughest hydraulic and dynamic sealing challenges. Combining elite polyurethane chemistry with precise molding and finishing, these O-rings offer exceptional abrasion resistance, high tensile strength, and long-lasting service life in demanding environments.
Key Performance Advantages of Urethane O-Rings
Urethane O-Rings excel where wear, extrusion and cyclic motion threaten seal integrity. Compared with many elastomers, polyurethane provides superior tear and abrasion resistance, excellent load-bearing capacity, and low compression set—critical for maintaining seal geometry and preventing leaks over time. Typical temperature and chemical compatibility ranges are broad, and formulations can be optimized for oil, fuel, or synthetic hydraulic fluids.
Materials, Hardness & Customization
We produce Urethane O-Rings in a range of hardnesses, durometers, and compound options to suit static and dynamic applications. Polypac leverages decades of material science experience—originally centered on filled PTFE and now spanning NBR, FKM, silicone, EPDM, FFKM and urethane—to deliver tailored compounds for special working conditions. Custom sizes, tolerances, and post-processing (bonding, backup rings, coatings) are available to meet unique design requirements.
Manufacturing Excellence & Quality Assurance
Our custom rubber ring and O-ring factory spans over 10,000 m², with an 8,000 m² production space equipped with advanced molding and testing systems. Founded in 2008, Polypac maintains close R&D partnerships with universities and labs worldwide to continuously improve formulations and testing protocols. Every Urethane O-Ring undergoes rigorous inspection for dimensional accuracy, hardness, and performance under simulated working conditions.
Applications & Why Choose Polypac
Urethane O-Rings are ideal for hydraulic cylinders, pneumatic actuators, rotating shafts, and heavy-duty machinery where abrasion and extrusion resistance are critical. Choose Polypac for proven material expertise, scalable production, and responsive custom sealing solutions. Contact us to specify Urethane O-Rings tailored to your project—our engineering team is ready to support design, testing, and rapid production.
Urethane O-Rings Display
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.
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.
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.
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.
Plumbing & HVAC O-Ring Kits012 HITACHI | Assortments for Water, Refrigerant & Gas Connections
Plumbing & HVAC O-Ring Kits012 HITACHI | Assortments for Water, Refrigerant & Gas Connections
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Mini O-Ring Kits-011 SUMITOM | Compact Assortments for Electronics, RC Models & Small Appliances
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FKM O-Ring Kits | High-Temp & Chemical Resistant Seal Assortments
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Buna-N (Nitrile) O-Ring Kits-008 KOMATSU | Oil Resistant Seal Assortments for General Purpose Use
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Metric O-Ring Kits-007 CAT-A | Precision Sized Assortments for European & Asian Machinery
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AS568 Standard O-Ring Kits-006 CAT-GM | SAE Dash Size Assortments for Hydraulics & Pneumatics
Plumbing & HVAC O-Ring Kits012 HITACHI | Assortments for Water, Refrigerant & Gas Connections
Plumbing & HVAC O-Ring Kits012 HITACHI | Assortments for Water, Refrigerant & Gas Connections
Mini O-Ring Kits-011 SUMITOM | Compact Assortments for Electronics, RC Models & Small Appliances
Mini O-Ring Kits-011 SUMITOM | Compact Assortments for Electronics, RC Models & Small Appliances
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FKM O-Ring Kits | High-Temp & Chemical Resistant Seal Assortments
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Buna-N (Nitrile) O-Ring Kits-008 KOMATSU | Oil Resistant Seal Assortments for General Purpose Use
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Metric O-Ring Kits-007 CAT-A | Precision Sized Assortments for European & Asian Machinery
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AS568 Standard O-Ring Kits-006 CAT-GM | SAE Dash Size Assortments for Hydraulics & Pneumatics
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O-Ring Kits-005 CAT-Joint | Complete Assortments for Industrial Repair & Maintenance
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Nitrile & Viton O-Ring Kits CAT 4C8253 | Chemical & Temperature Resistant Seal Assortments.
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O-Ring Kits CAT 4C4782 | Assorted Seal Kits for Repair, Maintenance & DIY Projects
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Tube-801 | Industrial & DIY Tubing for Plumbing, Pneumatics, Hydraulics & Protection
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Tubes-T01 | Flexible & Rigid Pipe for Fluid, Air & Electrical Applications
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