Nitrile Butadiene Rubber (NBR), also known as Buna-N, is a synthetic rubber copolymer consisting of acrylonitrile (ACN) and butadiene (BD) monomers. It is a versatile elastomer with excellent oil resistance and mechanical properties, making it widely used in various industries.
Product Specific Details
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HS Code: |
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Grade: |
40%-50% 18%-40%
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Packaging Type: |
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The structure of NBR can be represented as follows:
[-CH2-CH(CN)-]m [-CH=CH-CH2-]n
In this structure, Acrylonitrile (ACN) units represented by (-CH2-CH(CN)-) and Butadiene (BD) units represented by (-CH=CH-CH2-), the "m" and "n" represent the number of repeating units of acrylonitrile and butadiene, respectively, and the brackets indicate that these units repeat throughout the polymer chain.
NBR is produced through a process called emulsion polymerization. The monomers, acrylonitrile, and butadiene, are mixed with a water-based emulsion and other additives such as emulsifiers and catalysts. The emulsion is then heated and agitated to initiate the polymerization reaction. As the reaction progresses, the monomers polymerize, forming long chains of repeating units.
The acrylonitrile component in NBR provides the rubber with its excellent oil resistance, chemical resistance, and thermal stability. It also contributes to its high tensile strength and abrasion resistance. The butadiene component, on the other hand, enhances the rubber's elasticity and low-temperature flexibility.
The percentage of acrylonitrile in the copolymer can vary, typically ranging from 18% to 50%. Higher acrylonitrile content results in improved oil resistance but reduced low-temperature flexibility. Conversely, lower acrylonitrile content improves low-temperature performance but reduces oil resistance. The desired acrylonitrile content is determined based on the specific application requirements.
In addition to its inherent properties, NBR can be further modified with fillers, plasticizers, curing agents, and other additives to enhance specific characteristics such as flame resistance, electrical conductivity, or improved processability during manufacturing.
NBR and its Grades,
NBR 3310
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Property
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Description
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1
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Polymer Structure
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Random copolymer of Acrylonitrile and butadiene
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2
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Mooney Viscosity
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110 MU
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3
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Monomer Ratio
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33% Acrylonitrile, 67% Butadiene
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4
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Molecular Weight
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Relatively high
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5
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Physical Form
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Solid Pellets and bales
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6
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Tensile Strength
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Good
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7
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Elasticity and Resilience
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Excellent
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8
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Temperature Range
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-50°C to 100°C (-58°F to 212°F)
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9
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Chemical Resistance
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Moderate resistance to chemicals and oils
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10
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Applications
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hoses and conveyor belts, and bonding with metals,
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NBR 3330
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Property
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Description
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1
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Polymer Structure
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Random copolymer of Acrylonitrile and butadiene
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2
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Mooney Viscosity
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30 MU
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3
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Monomer Ratio
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33% Acrylonitrile, 67% Butadiene
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4
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Molecular Weight
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Relatively high
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5
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Physical Form
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Solid Pellets and bales
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6
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Tensile Strength
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Good
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7
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Elasticity and Resilience
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Excellent
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8
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Temperature Range
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-50°C to 100°C (-58°F to 212°F)
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9
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Chemical Resistance
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Moderate resistance to chemicals and oils
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10
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Applications
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engine seals, transmission seals, and O-rings
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NBR 1041
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Property
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Description
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1
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Polymer Structure
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Random copolymer of Acrylonitrile and butadiene
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2
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Mooney Viscosity
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82.5 MU
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3
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Monomer Ratio
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40.5% Acrylonitrile, 59.5% Butadiene
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4
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Molecular Weight
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Relatively high
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5
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Physical Form
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Bales
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6
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Tensile Strength
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Good
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7
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Elasticity and Resilience
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Excellent
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8
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Temperature Range
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-50°C to 100°C (-58°F to 212°F)
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9
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Chemical Resistance
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Moderate resistance to chemicals and oils
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10
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Applications
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oil seals, fuel system components, gaskets, O-rings, and hoses
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NBR 1043
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Property
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Description
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1
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Polymer Structure
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Random copolymer of Acrylonitrile and butadiene
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2
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Mooney Viscosity
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77.5 MU
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3
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Monomer Ratio
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29% Acrylonitrile, 71% Butadiene
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4
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Molecular Weight
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Relatively high
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5
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Physical Form
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Bales
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6
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Tensile Strength
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Good
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7
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Elasticity and Resilience
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Excellent
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8
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Temperature Range
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-50°C to 100°C (-58°F to 212°F)
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9
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Chemical Resistance
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Moderate resistance to chemicals and oils
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10
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Applications
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fuel system components, gaskets, O-rings, hoses, sealing components for pumps, valves, and machinery in various industrial sectors.
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NBR 6230
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Property
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Description
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1
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Polymer Structure
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Random copolymer of Acrylonitrile and butadiene
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2
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Mooney Viscosity
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33 MU
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3
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Monomer Ratio
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31-35% Acrylonitrile, 69-65% Butadiene
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4
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Molecular Weight
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Relatively high
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5
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Physical Form
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Bales
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6
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Tensile Strength
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Good
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7
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Elasticity and Resilience
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Excellent
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8
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Temperature Range
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-50°C to 100°C (-58°F to 212°F)
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9
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Chemical Resistance
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Oil Resistance Processability
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10
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Applications
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Packaging Roll, Shoe Sole, Belt
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Top 5 importers and Exporters of NBR, as of 2022, by Volume:
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Exporters
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Importers
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South Korea
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Sri Lanka
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Taiwan
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Malaysia
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Malaysia
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Thailand
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Thailand
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China
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China
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Viet Nam
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Top 5 Manufacturers, by Capacity, (in KTPA):
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Kumho
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Arlanxeo
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LG Chem
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Zeon
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Ningbo Shunze Rubber Co. Ltd
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Top 4 End-use Industries (by Volume):
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Automotive
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Construction
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Medical and Healthcare Industry
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Industrial Machinery Equipment
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