Tips For Choosing the Right O-Ring

There are two basic o-ring sizes for mechanical applications: standard and metric. While standard o-rings are generally available in all sizes, metric rings aren’t as common. In order to help with your selection, Parker Hannifin has provided a chart with the common o-ring sizes. It also offers information on their metric line. Listed below are some tips for choosing the right o-ring.

NBR compound formulation

Parker Seals has developed several O-rings in the NBR compound formulation with a variety of unique physical and chemical properties. These materials are made by reacting a polyol and a diisocyanate, which produces a strong, durable elastomer. It is popular because of its excellent strength and tear and permeation resistance. It is available in a wide range of colors and custom designs.

HNBR o-rings are a special type of O-ring that is made from hydrogenated nitrile (HNBR). Its advantages over other materials include higher fuel compatibility and strength at higher temperatures. However, this type of o-ring is able to handle a variety of petroleum and hydrocarbon fluids.

The NBR compound formulation has been extensively studied to ensure it can withstand extreme temperatures. Parker O-Rings NBR compounds are designed to outperform standard materials. This type of compound is more resistant to the effects of temperature and is NORSOK-compliant. Listed below are a few key benefits of the NBR compound formulation:

The chemical composition of NBR compounds varies greatly. The content of Acrylonitrile in the polymer chains can range from 18% to 50%. The lower the percentage of ACN, the better the low-temperature flexibility. The higher the ACN content, the less apt the compound will perform in extreme temperatures. Additionally, high Acrylonitrile content will negatively affect the low-temperature flexibility and compression set resistance. If you have any questions regarding the compounds that are most suitable for your application, Marco Rubber’s engineers will be more than happy to help.

Typical application

In a variety of applications, Parker O-Rings play a vital role. These components provide the ultimate combination of strength and resistance to tears and permeation. They are available in a variety of compounds to meet your needs. These materials are often used in medical devices, such as surgical instruments and stethoscopes. Typical applications for Parker O-Rings include:

When selecting a specific type of o-ring, it is helpful to understand the application. A simple chart will allow you to easily determine what type of o-ring fits your application. However, if you have questions about the exact type of material needed, a team of application engineers can help you with the process. As an Authorized Distributor of Parker O-Rings, you can rely on our vast expertise and experience to select the perfect o-ring for your needs.

When choosing a specific o-ring, it is important to consider operating conditions and other factors. For example, what is the pressure or temperature needed to seal?

Dimensional control

If you need to replace a worn or damaged O-ring in your hydraulic cylinder or pneumatic component, you can trust Parker O-Rings for exceptional performance. The company has been in the business for decades, and partners with distributors like AOP Technologies to provide the best solutions for customers. Parker o-rings can be custom-made to fit your specific needs, from diameter to shape. With a variety of materials and sizes, you can choose the right one for the application.

The company’s Sealing Guide, a 74-page resource, covers all aspects of manufacturing. Moreover, the company’s quality assurance and Controlled Batch Identification (CBI) programs, latest inspection techniques, dimensional control, R&D labs, and materials formulations are all discussed in depth. The company’s exemplary quality assurance standards are reflected in the certifications it has earned in multiple fields, including semiconductor, oil & gas, fluid power, and aerospace.

The Parker O-Ring Handbook provides detailed information on the material and common applications of o-rings. The handbook also covers the failure modes of o-rings, international sizes, and gas compatibility data. It’s the go-to guide for the industry. It includes extensive information about elastomers, common applications, and o-ring failure modes. Further, the manual contains basic information on the design of static and dynamic seals, including international sizes.

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Chemical compatibility

When choosing the correct o-ring, its chemical compatibility should be considered. The Parker O-Ring Handbook highlights over 1,800 chemicals and highlights their compatibility ratings against common o-ring materials. The matrix lists the chemicals alphabetically with their materials listed in column headers. When purchasing a ring, be sure to choose the correct material, based on its purpose and your industry. Listed below are some tips for selecting the right o-ring for your application.

Choose a material that has high chemical resistance. Parker Hannifin uses 70-durometer hard nitrile for most standard O-rings. For tube fittings and adapters, they offer 90-durometer hard nitrile. Although these materials are highly resistant to many chemicals, experts do not recommend using them in environments where they can withstand corrosive gases or solvents.

Ageing resistance

Among the benefits of EPDM / EPR O-Rings are their excellent chemical and thermal resistance. This material is suitable for water applications but is not recommended for contact with most oils. EPDM and EPR elastomers are both synthetic rubbers and come in a variety of forms. The main difference between EPDM and EPR terpolymer is the degree of curing. Using sulphur or peroxide is an option for improving EPDM O-Rings’ aging resistance.

Synthetic rubber possesses excellent heat, oil, and flame resistance. Its operating temperature range is -20degF to 400degF. The durometer hardness of the material varies from 40 to 90. You can also choose custom-colored synthetic rubber/elastomer.


Among the many types of O-Rings available on the market, polyurethane is a highly desirable material for a variety of applications. The result is an extremely tough, durable material with excellent tear and permeation resistance. Parker seals offer this material at a variety of prices, and their pricing structure makes it easy for consumers to find the right o-ring for their application.

You can find many other products from Parker, including custom-molded metal seals and extruded silicone profiles. To learn more about the different types of Parker O-rings, visit the website. Prices vary widely, depending on the type of material and compound. If you’re in need of a particular material, you can look for an O-Ring datasheet by compound number.

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