What is Nitrile butadiene rubber(NBR)
- Mingpai
- 2024-06-07 14:39:51
Nitrile Butadiene Rubber (NBR), also known as Buna-N or acrylonitrile butadiene rubber, is a synthetic copolymer rubber synthesized from two monomers: butadiene and acrylonitrile. The proportion of acrylonitrile in the polymer chain can significantly vary, usually ranging from 18% to 50%, and this variation greatly influences the properties of the resulting NBR.
Key Features and Properties of Nitrile Butadiene Rubber:
Oil Resistance: One of the most notable features of NBR is its excellent resistance to oils, fuels, and various petrochemicals. The higher the acrylonitrile content, the better the oil resistance, making it ideal for sealing and gasket applications in the automotive and aerospace industries.
Temperature Resistance: NBR performs well over a wide temperature range, maintaining its properties from -40°C to +100°C (-40°F to +212°F) approximately, though special grades can function at even higher temperatures for short periods.
Abrasion Resistance: It exhibits good to excellent resistance to abrasion and wear, enhancing its durability in applications subject to mechanical stress.
Chemical Resistance: Besides oils, NBR also resists many chemicals, including aliphatic hydrocarbons, making it suitable for various industrial applications.
Impermeability: NBR has low gas permeability, which is beneficial for applications requiring airtight seals.
Non-polar Nature: Being a non-polar material, NBR does not readily absorb water, which is advantageous in applications where water resistance is necessary.
Customizability: By adjusting the acrylonitrile content, hardness, and other additives, NBR's properties can be tailored to meet specific application needs.
Applications of Nitrile Butadiene Rubber:
- Seals and Gaskets: Widely used in fuel systems, hydraulic systems, and machinery due to its oil resistance.
- Fuel and Oil Handling Hoses: Suitable for transferring oils and fuels without degradation of the hose material.
- ** Automotive Parts**: Such as O-rings, hoses, and belts, especially in engine compartments due to its heat and oil resistance.
- Gloves: NBR gloves provide protection against oils, solvents, and chemicals, commonly used in industrial and medical settings.
- Printing Rolls: Its good abrasion resistance makes it suitable for printing and paper processing equipment.
- Adhesives and Coatings: NBR-based adhesives and coatings find use where oil and chemical resistance are required.
Nitrile Butadiene Rubber's unique blend of properties makes it a versatile material choice across multiple industries where resistance to oil, fuel, and other chemicals, combined with mechanical resilience, is crucial.
