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Nitrile vs. NBR: Understanding the Key Differences.
When it comes to rubber materials used in seals, gaskets, O-rings, and other industrial applications, nitrile and NBR are two common options. While they may sound very similar, there are distinct differences between nitrile and NBR that are important to understand in order to choose the right material for your specific needs. In this article, we will explore the key differences between nitrile and NBR.
Chemical Composition.
Nitrile rubber, also known as Buna-N or NBR, is a synthetic rubber copolymer of acrylonitrile and butadiene. The percentage of acrylonitrile in the polymer determines its chemical resistance and temperature range. Nitrile rubber typically contains 18-50% acrylonitrile content.
NBR, on the other hand, stands for nitrile butadiene rubber and is a type of synthetic rubber that is commonly used in automotive and industrial applications. NBR is a copolymer of butadiene and acrylonitrile and usually contains 18-50% acrylonitrile content.
Compatibility with Chemicals.
One of the key differences between nitrile and NBR lies in their chemical compatibility. Nitrile rubber has excellent resistance to oils, fuels, and other petroleum-based products. It is commonly used in applications where exposure to oils and fuels is a concern. However, nitrile rubber is not recommended for use with ozone, ketones, esters, and aromatic hydrocarbons.
NBR, on the other hand, has better resistance to chemicals such as acids, alkalis, and solvents compared to nitrile rubber. This makes NBR a preferred choice for applications where exposure to a wider range of chemicals is a concern.
Temperature Resistance.
Another important factor to consider when choosing between nitrile and NBR is their temperature resistance. Nitrile rubber offers good resistance to low temperatures, withstanding temperatures as low as -40°C. However, nitrile rubber may not be suitable for high-temperature applications, as it starts to degrade at temperatures above 121°C.
NBR, on the other hand, offers better resistance to high temperatures compared to nitrile rubber. NBR can withstand temperatures ranging from -30°C to 100°C, making it suitable for a wider range of temperature applications.
Physical Properties.
In terms of physical properties, nitrile rubber is known for its excellent tensile strength, tear resistance, and abrasion resistance. It is a durable material that can withstand heavy wear and tear, making it ideal for applications where mechanical properties are crucial.
NBR also offers good tensile strength and tear resistance, but it is generally softer and more flexible compared to nitrile rubber. This makes NBR a preferred choice for applications where flexibility is a key requirement.
Conclusion.
In conclusion, nitrile and NBR are two distinct rubber materials with their own set of properties and characteristics. While nitrile rubber is known for its excellent resistance to oils and fuels, NBR offers better resistance to a wider range of chemicals. Additionally, nitrile rubber has good low-temperature resistance, while NBR provides better high-temperature resistance.
Ultimately, the choice between nitrile and NBR will depend on the specific requirements of your application. By understanding the key differences between these two materials, you can make an informed decision to select the most suitable rubber material for your needs.
If you have any further questions about the differences between nitrile and NBR, feel free to contact us for more information.
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