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PU O-Rings – High-Performance Polyurethane Seals by Polypac

PU O-Rings: Durable Polyurethane Seals for Demanding Applications

Why Choose PU O-Rings?

PU O-Rings (polyurethane O-rings) deliver unmatched abrasion resistance, high tensile strength, and low compression set—making them ideal for dynamic and high-wear sealing environments. Compared with conventional elastomers, PU O-Rings excel in extrusion resistance and long-term durability under cyclic load, helping reduce maintenance intervals and downtime.

Material & Performance Characteristics

Polyurethane formulations used by Polypac are engineered for a wide hardness range and tailored chemical compatibility. Typical benefits include superior tear strength, excellent resistance to hydraulic fluids and oils, and predictable thermal performance across common operating temperatures. Our material development ensures PU O-Rings maintain sealing integrity under high pressure, high velocity, and abrasive particulate conditions.

Typical Applications

PU O-Rings are widely used in hydraulics, pneumatics, mobile equipment, injection molding machinery, and heavy industry where dynamic sealing and extrusion control are critical. They are preferred in cylinders, piston seals, rod seals, and rotary interfaces where wear resistance and long service life are priorities.

Customization, Production & Quality Assurance

Polypac’s custom rubber ring and O-ring factory spans over 10,000 m² with an 8,000 m² production area and industry-leading production and testing equipment. We offer custom sizing, hardness specification, rapid prototyping, and batch testing. Long-term collaborations with universities and research institutions support ongoing material innovation and rigorous quality control for every batch of PU O-Rings we produce.

Polypac Advantage & Call to Action

Founded in 2008, Polypac began with filled PTFE seals and expanded to produce O-rings in NBR, FKM, silicone, EPDM, FFKM—and high-performance PU O-Rings. As an award-winning seal manufacturer and oil seal supplier, we combine scientific R&D with practical manufacturing expertise to deliver reliable sealing solutions for special working conditions. Contact Polypac today for quotes, material recommendations, and custom PU O-Rings designed to extend equipment life and reduce total cost of ownership.

PU O-Rings Display

FAQ:

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.

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.

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 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.

Table of Contents

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PU O-Rings: Durable Polyurethane Seals for Demanding Applications
Why Choose PU O-Rings?
Material & Performance Characteristics
Typical Applications
Customization, Production & Quality Assurance
Polypac Advantage & Call to Action
PU O-Rings Display

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