Carboxylated Nitrile

Carboxylated Nitrile, or XNBR, is produced by adding a carboxylic acid side group to nitrile rubber, thereby adding more crosslinking sites than traditional NBR. As a result, solvent swell and abrasion resistance are significantly improved, as well as modulus, tensile strength and tear resistance. Accordingly, XNBR is frequently specified in dynamic applications such as rod seals or wipers. Water resistance, resilience and some low temperature properties are somewhat diminished.

Nitrile elastomers, recognized for their durability and versatility, are widely utilized in various industrial applications. Among them, specialized nitrile elastomers like Carboxylated Nitrile Butadiene Rubber (XNBR) and Hydrogenated Nitrile Butadiene Rubber (HNBR) offer unique characteristics that distinguish them. These advanced materials provide enhanced performance in demanding environments, making them a top choice across diverse applications.

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Carboxylated Nitrile Butadiene Rubber (XNBR)

 

XNBR is a modified version of nitrile rubber, incorporating carboxyl groups into its polymer structure, giving XNBR several key advantages:  

Improved Abrasion Resistance

The introduction of carboxyl groups greatly elevates the abrasion resistance of XNBR. This characteristic makes it suitable for applications where materials encounter constant friction or wear, including seals, gaskets, and conveyor belts. 

Enhanced Mechanical Strength

Compared to standard nitrile rubber, XNBR boasts superior tensile strength and tear resistance. This strength is essential for components that must endure high pressure and mechanical stress without deformation or failure. 

Chemical Resistance

Like its nitrile counterparts, XNBR exhibits excellent resistance to oils, fuels, and various chemicals. This trait guarantees durability and longevity in harsh chemical environments found in industries such as automotive and oil and gas. 

Flexibility in Low Temperatures

Despite its resilience, XNBR retains flexibility at low temperatures, an essential property for applications in cold environments or those requiring consistent performance across a wide temperature range. 

Hydrogenated Nitrile Butadiene Rubber (HNBR)

 

HNBR is another specialized nitrile elastomer, formed through the hydrogenation of standard nitrile rubber. This process saturates the polymer, leading to enhanced features: 

Outstanding Heat Resistance

One of HNBR's significant advantages is its ability to endure high temperatures, reaching approximately 329°F. This feature renders HNBR suitable for applications in high-temperature environments, such as automotive engine components, where other materials may fail. 

Superior Chemical and Oil Resistance

HNBR showcases exceptional resistance to a broad spectrum of chemicals, oils, and fuels, making it useful in automotive fuel systems, oil exploration equipment, and industrial machinery where exposure to harsh substances is common. 

Enhanced Ozone and Weather Resistance

The hydrogenation process improves HNBR's resilience to ozone and weathering, prolonging the material's lifespan in outdoor applications. This durability makes it an excellent option for seals, hoses, and components exposed to environmental factors.

Mechanical Strength and Flexibility

HNBR combines high mechanical strength with flexibility, ensuring reliable performance in dynamic applications. It maintains its properties under cyclic loading and stress, making it ideal for seals, gaskets, and vibration dampening components. 

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Contact us to discuss your requirements of Carboxylic nitrile latex. Our experienced sales team can help you identify the options that best suit your needs.

Applications and Industries

 

The unique characteristics of XNBR and HNBR have led to their widespread use across various industries: 

• Automotive:

  Used in seals, gaskets, and fuel system components for their oil and heat resistance.

   

• Oil and Gas:

  Essential for drilling tools, hoses, and seals where chemical resistance is critical.

   

• Industrial Machinery:

  Utilized in hydraulic systems, pumps, and conveyor belts for their durability and abrasion resistance.

   

• Aerospace:

  Implemented in seals and gaskets for their capability to withstand extreme temperatures and chemical exposure.

   

• Medical:

  XNBR is found in medical gloves and other equipment needing puncture resistance and flexibility.

   

Conclusion

 

Specialty nitrile elastomers like XNBR and HNBR provide an array of benefits, making them an excellent choice for numerous high-performance applications. Their enhanced mechanical strength, chemical resistance, flexibility, and durability ensure reliable operation in the most demanding environments.  

Our team at Harwood Rubber Products has extensive experience working with specialty elastomers like HNBR and XNBR and can advise you on their suitability for your unique applications. To learn more about the high-quality industrial rubber rollers and custom rubber products our team offers, feel free to reach out today!

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