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XNBR - Carboxylated Nitrile Rubber

XNBR, or Carboxylated Nitrile Rubber, is a synthetic rubber that offers a unique set of properties. It is a variation of nitrile rubber (NBR) that has been chemically modified by introducing carboxyl groups onto the polymer chain. This modification enhances certain properties of the rubber, making it suitable for specific applications. The properties of an XNBR rubber compound are determined by the specific formulation and combination of ingredients used in its production. Here are some key properties of XNBR rubber:
  1. Hardness: The hardness of an XNBR compound can be adjusted by varying the ratio of XNBR polymer to other components, such as fillers or plasticizers. Hardness is typically measured using the Shore durometer scale (e.g., Shore A or Shore D).

  2. Tensile Strength and Elongation: XNBR compounds generally exhibit good tensile strength and elongation properties, which allow them to withstand stretching and mechanical stresses without failure. These properties can be optimized by selecting appropriate XNBR polymer grades and reinforcing agents.

  3. Compression Set: The compression set resistance of an XNBR compound refers to its ability to recover its original shape after being compressed. This property can be improved by incorporating additives such as peroxides or coagents during the compounding process.

  4. Oil Resistance: XNBR compounds offer excellent resistance to oils, fuels, and hydrocarbon-based fluids. This property is inherent to the XNBR polymer itself and can be further enhanced by selecting appropriate compounding ingredients and fillers.

  5. Chemical Resistance: XNBR compounds generally exhibit good resistance to a wide range of chemicals. However, the specific chemical resistance can be influenced by the choice of additives and fillers used in the compound.

  6. Temperature Resistance: XNBR compounds can withstand higher temperatures compared to standard NBR compounds. The selection of appropriate compounding ingredients and crosslinking agents can improve the heat resistance of the compound.

  7. Abrasion Resistance: XNBR compounds can be formulated to have good resistance to abrasion, making them suitable for applications that involve contact with rough surfaces or materials. Reinforcing fillers, such as carbon black or silica, are often used to improve abrasion resistance.

  8. Weather Resistance: XNBR compounds generally exhibit moderate resistance to weathering and ozone. Additional additives, such as antioxidants or UV stabilizers, can be incorporated to enhance the weather resistance of the compound.

It’s important to note that the specific properties of an XNBR rubber compound can vary significantly depending on the formulation, processing conditions, and the intended application. we customize the compound to meet specific requirements.

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