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, known for their robustness and versatility, have long been a staple in various industrial applications. Among them, specialty nitrile elastomers like Carboxylated Nitrile Butadiene Rubber (XNBR) and Hydrogenated Nitrile Butadiene Rubber (HNBR) offer unique properties that set them apart. These advanced materials provide enhanced performance in demanding environments, making them a popular choice in many different 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 addition of carboxyl groups significantly enhances the abrasion resistance of XNBR. This makes it ideal for applications where materials are subjected to continuous friction or wear, such as in seals, gaskets, and conveyor belts. 

Enhanced Mechanical Strength

XNBR exhibits superior tensile strength and tear resistance compared to standard nitrile rubber. This strength is crucial for components that must withstand high pressure and mechanical stress without deforming or failing. 

Chemical Resistance

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

Flexibility in Low Temperatures

Despite its toughness, XNBR maintains flexibility at low temperatures. This property is essential for applications in cold climates or where materials must perform reliably across a broad temperature range. 

Hydrogenated Nitrile Butadiene Rubber (HNBR)

 

HNBR is another specialty nitrile elastomer, created by hydrogenating standard nitrile rubber. This process saturates the polymer, resulting in enhanced properties: 

Outstanding Heat Resistance

One of the most significant benefits of HNBR is its ability to withstand high temperatures, up to approximately 329°F. This makes HNBR suitable for applications involving high-temperature environments, such as automotive engine components, where other materials might fail. 

Superior Chemical and Oil Resistance

HNBR demonstrates excellent resistance to a wide range of chemicals, oils, and fuels. This property ensures its suitability for use in automotive fuel systems, oil exploration equipment, and industrial machinery where exposure to harsh chemicals is common. 

Enhanced Ozone and Weather Resistance

The hydrogenation process improves HNBR&#;s resistance to ozone and weathering, extending the material&#;s lifespan in outdoor applications. This resilience makes it an excellent choice for seals, hoses, and other components exposed to environmental elements.

Mechanical Strength and Flexibility

HNBR combines high mechanical strength with flexibility, providing reliable performance in dynamic applications. It maintains its properties under cyclic loading and stress, making it ideal for use in 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 properties of XNBR and HNBR have led to their widespread adoption in various industries: 

• Automotive:

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

   

• Oil and Gas:

  Essential for drilling equipment, hoses, and seals, where chemical resistance is crucial.

   

• Industrial Machinery:

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

   

• Aerospace:

  Used in seals and gaskets for their ability to withstand extreme temperatures and chemical exposure.

   

• Medical:

  XNBR is used in medical gloves and other equipment requiring puncture resistance and flexibility.

   

Conclusion

 

Specialty nitrile elastomers like XNBR and HNBR offer a range of benefits that make them a great choice in many high-performance applications. Their enhanced mechanical strength, chemical resistance, flexibility, and durability ensure reliable performance in the most demanding environments.  

Our team at Harwood Rubber Products is highly skilled in working with specialty elastomers like HNBR and XNBR and can recommend these materials for your unique applications when it&#;s the right fit. To learn more about the high-quality industrial rubber rollers and custom rubber products our team manufactures, reach out to our team today!

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