Tianjin Fuyote Technology Co.,Ltd.
Tianjin Fuyote Technology Co.,Ltd.

Nitrile Buna-N (NBR) O-Rings - The Reliable Choice for Mechanical Face Seals

O-Rings are fundamental components in mechanical face seals, providing a critical sealing interface between two surfaces. Nitrile Buna-N (NBR) O-Rings, in particular, are widely used due to their excellent sealing properties, chemical resistance, and cost-effectiveness. In this article, we will explore the features and benefits of NBR O-Rings in mechanical face seals, highlighting their applications and advantages across different industries.

Understanding Nitrile Buna-N (NBR) O-Rings

NBR O-Rings are made from a synthetic rubber known as nitrile butadiene rubber. This material offers excellent resistance to oils, fuels, and greases, making it a popular choice for sealing applications. NBR O-Rings are available in various sizes and durometers to accommodate different sealing requirements. When used in mechanical face seals, they provide an effective sealing interface, preventing leakage and contamination.

Applications and Benefits


NBR O-rings are commonly used in mining equipment due to their excellent resistance to abrasion, oils, and chemicals. They can be found in hydraulic systems, pumps, valves, and sealing applications in mining machinery.


NBR O-rings are utilized in construction equipment and machinery where sealing is critical. They are commonly found in final drives, boom-type road header, underground mining trucks, and seals for construction vehicles such as excavators, bulldozers, and loaders.


NBR O-rings are well-suited for agricultural applications due to their resistance to oils, fuels, and chemicals. They are used in agricultural machinery such as  harvesters and gearboxes. NBR O-rings provide effective sealing in agriculture machinery.

Rail vehicles

NBR O-rings are used extensively in the railway industry for sealing applications. NBR O-rings offer good resistance to lubricants, fuels, and weathering, making them suitable for rail vehicle applications.

Conveyor systems

NBR O-rings are utilized in conveyor systems for material handling in various industries. They provide sealing solutions for mining scraper chain conveyor and other components in conveyor belts. NBR O-rings offer resistance to oils, greases, and abrasion, ensuring reliable operation in conveyor systems.

In addition to these industries, NBR O-rings can be found in a wide range of other applications where sealing and resistance to oils, fuels, and chemicals are required. They are widely used in automotive, aerospace, marine, and manufacturing industries as well.

Advantages of Nitrile Buna-N (NBR) O-Rings

Excellent Sealing Performance

NBR O-Rings offer exceptional sealing performance, ensuring a tight and reliable seal between components. Their ability to conform to irregularities in sealing surfaces allows for effective sealing, even in applications with slight misalignments or surface imperfections.

Chemical Resistance

NBR O-Rings exhibit excellent resistance to oils, fuels, hydraulic fluids, and a wide range of industrial chemicals. This chemical resistance prevents degradation and swelling of the O-Rings, ensuring long-term sealing performance in various environments.


NBR O-Rings are known for their cost-effectiveness, offering a reliable sealing solution at an affordable price point. Their durability, ease of installation, and availability in standard sizes contribute to lower maintenance costs and reduced downtime for equipment.

Wide Temperature Range

NBR O-Rings can operate effectively across a wide temperature range, typically from -40°C to 120°C (-40°F to 250°F). This thermal stability allows them to maintain their sealing properties in both hot and cold environments, making them suitable for diverse industrial applications.

Whether in the automotive sector, industrial machinery, or HVAC and plumbing systems, NBR O-Rings continue to serve as a trusted sealing solution, ensuring optimal performance and reliability in a wide range of applications.