Polyurethane O-rings are plastic seals connecting two product parts that transfer liquid or gas between them. Squeezed between the two parts under high pressure, the O-ring must create an impenetrable seal that prevents any fluid or gas from escaping.

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If you're looking for O-rings with high load-bearing capacity, superior abrasion resistance, and durability against cracking, tearing, and splitting, Wyatt Seal can find or create the precisely-crafted polyurethane O-rings you need for any project.

Wyatt Seal can quickly help you find the exact O-ring solution, polyurethane or otherwise, to fit your design specifications precisely and durably.

In the manufacturing of ball bearings, it is a standard practice for AMI to assemble its rings and balls with a specified internal clearance.  In the case of High-Temp inserts, internal clearance is even more important in compensating for thermal expansion of bearings, shafts and housings.  AMI uses internal clearance standard of (C4) on all of our High-Temp inserts.

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Our sealing experts have 50 years of experience and relationships that enable us to find the exact O-ring you need—and if that seal doesn’t exist yet, we can make it for you.

Most standard units are supplied with a nitrile rubber seal.  Nitrile rubber is an excellent seal at temperatures ranging from 0 to 212 degrees F.  Soon after that temperature, nitrile rubber starts to breakdown… Leaving no sealing element to retain the High-Temp lubrication. Silicone seals have excellent temperature stability, exceptional release from sticking, resistance to aging, ozone, sunlight and outstanding water repellence.  The use of silicone seals insures that the High-Temp lube stays where it belongs… in the bearing!

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Polyurethane plastics consist of organic polymers. These organic molecules are linked with urethane by introducing a polyol to a diisocyanate or a polymeric isocyanate, along with additives and catalysts that generate different types of polyurethane compounds.

In order to allow the silicone to properly do its job as a seal, AMI uses a special zinc anodized slinger to protect it.  The purpose of a slinger is not only to protect the seal, but also to provide the first line of defense for the balls and retainer against contaminants.  Using a standard cold rolled steel slinger in a High-Temp application may initially provide protection, but quite possibly corrode and lead to premature bearing failure.  AMI’s process of zinc anodization produces a slinger with two key attributes… Heat and Abrasion Resistance. A resistance that will maintain its properties well past the operating temperature of the bearings.

We’ll help you find the right solution for any application so that you can remain competitive and ready for the next challenge. Let’s talk about your project today.

Polyurethane O-rings are often the first choice of design engineers working with automotive and aerospace products, including:

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We can source O-rings manufactured from various polyurethane compounds with different temperatures and chemical tolerances. If you can’t find your ideal solution on the market, contact us to manufacture custom polyurethane O-rings matching your specifications.

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Give us your specifications, and we will guide you easily through the entire process, from design and testing to ordering and delivery.

Most bearing manufacturers consider lubrication to be the only difference between a standard and High-Temperature insert, however the grease is only one of the many important elements that make up a true High-Temperature insert.

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Polyurethane O-rings operate optimally between temperatures of - 40ºF to 180ºF. However, polyurethane O-rings do not work well with steam, hot water, acids, esters, ketones, alcohols, ethers, glycols, amines, or alkalis.

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We can find exactly the right size and material for your O-rings, helping you achieve precision performance for all of your projects.

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If you're a design engineer hunting for the right O-ring with excellent abrasion resistance and long-lasting durability, polyurethane O-rings check both boxes. This thermoplastic elastomer resists degradation from exposure to gas, hydraulic oil, hydrocarbon fuels, greases, silicone oils, and mineral oils.

AMI’s High Temperature Units are specifically designed to operate in temperatures up to 450 °F.  The combination of heat stabilization, greater internal clearance, advanced silicone seals, specially selected high temperature lubricants, and zinc anodized slingers are what make these units the perfect solution that can endure operating at elevated temperatures.  Available in C4HR5 (up to 400 °F) and C4HR23 (up to 450 °F).

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They can perform reliably under heavy loads, high impacts, and environments where abrasion, cuts, tears, and cracks are a risk, but only if they're the exact polyurethane composition, size, and shape for your project's specifications.

Polyurethane O-rings, commonly abbreviated as AU O-rings, also age well, withstanding the forces of oxygen, water, and ozone for a long lifespan under harsh conditions. Nevertheless, finding the exact O-ring for your project can take a lot of time—time that Wyatt Seal can save you.