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HNBR (Hydrogenated Nitrile)

  • CBD.SEALS
  • HNBR (Hydrogenated Nitrile)
    • High-performance / Oil and Abrasion Resistance for HNBR Rubber
    What is the HNBR Rubber ?

    HNBR rubber, known as Hydrogenated Nitrile Butadiene Rubber, is a high-performance synthetic rubber made by hydrogenation of Nitrile Butadiene Rubber (NBR).HNBR rubber has excellent heat, oil, abrasion, and chemical resistance and is an improved version of NBR rubber.

    Chemical structure and synthesis

    Monomers: The main monomers of HNBR rubber include Acrylonitrile (AN) and Butadiene (BD).

    Polymerization method: HNBR rubber is usually synthesized by emulsion polymerization. In the polymerization process, acrylonitrile and butadiene are copolymerized under the action of emulsifier and initiator to form nitrile rubber (NBR). Subsequently, NBR undergoes a hydrogenation reaction in the presence of a catalyst to hydrogenate the double bonds in the butadiene unit to form HNBR.

    Polymerization Initiator: Commonly used polymerization initiators include peroxides and azo compounds.

    Hydrogenation catalysts: Commonly used hydrogenation catalysts include palladium (Pd), nickel (Ni) and so on.

    Our CBD Seals HNBR Compounds information：

    Heat resistance: HNBR rubber can still maintain good performance at high temperature (usually up to 150°C or more), which is better than NBR rubber.

    Oil and fuel resistance: HNBR rubber has excellent resistance to petroleum-based oils, lubricants and fuels.

    Chemical resistance: HNBR rubber has good chemical resistance and can resist some acids, alkalis and solvents.

    Abrasion resistance: HNBR rubber has good abrasion resistance and is suitable for use in high wear environments.

    Mechanical properties: HNBR rubber has good tensile strength, tear strength and abrasion resistance.

    Low Temperature Properties: HNBR rubber’s low temperature performance is better than NBR rubber, able to maintain flexibility at lower temperatures.

    Processing and vulcanization

    Processing method: HNBR rubber can be processed by traditional rubber processing methods such as extrusion, calendering, injection molding, and molding. Due to its high viscosity and high melting point, processing is difficult and requires special equipment and technology.

    Vulcanization: Vulcanization of HNBR rubber usually uses sulfur, peroxide or metal oxides as vulcanizing agents. During vulcanization, the vulcanizing agent reacts with the rubber molecular chains to form a cross-linked network.

    Areas of application

    Automotive industry: used to manufacture oil and heat resistant automotive seals, hoses, belts, etc.

    Petrochemical industry: used to manufacture chemical-resistant seals, gaskets, etc.

    Aerospace: used to manufacture high temperature and chemical resistant aerospace seals.

    Industrial applications: used to manufacture wear-resistant, heat-resistant industrial seals, gaskets, etc.

    Energy industry: used to manufacture oil and heat resistant seals for oil field equipment.

    Sustainability

    Recycling: HNBR rubber can be recycled and reused to reduce the impact on the environment. Some advanced recycling technologies can convert waste HNBR rubber into new rubber products or other useful materials.

    HNBR rubber excels in high-performance applications with its excellent resistance to heat, oil, chemicals and abrasion, albeit at a higher cost.

    HNBR rubber outperforms fluoroelastomer in terms of oil resistance, cost-effectiveness and abrasion resistance, but not as good as fluoroelastomer in terms of high temperature resistance, some chemical resistance and weatherability.

    HNBR rubber is superior to NBR in terms of high temperature resistance, oil resistance, chemical resistance and abrasion resistance, but inferior to NBR in terms of cost and processability.