So, what makes Nitrile Rubber (NBR) unique?
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Nitrile rubber, also known as NBR, Buna-N, and acrylonitrile butadiene rubber, is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene.
Although its physical and chemical properties vary depending on the polymer&#;s composition of nitrile, this particular type of synthetic rubber is unusual in being generally resistant to oil, fuel, and other chemicals. So, the more nitrile within the polymer, the higher the resistance to oils but the lower the flexibility of the material.
Nitrile is the most widely used elastomer in the seal industry today. It is used in the automotive and aeronautical industry to make fuel and oil handling hoses, seals, grommets, and self-sealing fuel tanks, since ordinary rubbers cannot be used. NBR&#;s ability to withstand a range of temperatures from -40 to 108 °C (-40 to 226 °F) makes it an ideal material for aeronautical applications. Nitrile butadiene is also used to create moulded goods, footwear, adhesives, sealants, sponges, expanded foams, and floor mats. The uses of nitrile rubber include disposable non-latex gloves, automotive transmission belts, hoses, O-rings, gaskets, oil seals, V belts, static & dynamic hydraulic seals, synthetic leather, printer&#;s form rollers, and as cable jacketing; NBR latex can also be used in the preparation of adhesives and as a pigment binder.
Typical applications: Aircraft Fuel Systems, Automotive Fuel Systems, Off-Road Equipment & Marine Fuel Systems.
Its resilience also makes NBR a useful material for disposable lab, cleaning, and examination gloves. Nitrile rubber is more resistant than natural rubber to oils and acids, with superior strength, but does have less flexibility. Nitrile gloves are therefore more puncture-resistant than natural rubber gloves, especially if the latter are degraded by exposure to chemicals or ozone. Nitrile rubber is also less likely to cause an allergic reaction than natural rubber. Unlike polymers meant for ingestion, where small inconsistencies in chemical composition/structure can have a pronounced effect on the body, the general properties of NBR are not altered by minor structural/compositional differences.
Nitrile&#;s can be specially compounded to meet International Food Standards such as FDA 21.177 ; (EC) :; BfR XXI.
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NBR (Nitrile), chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content varies in commercial products from 18% to 50%. As the NBR content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases.
Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -35°C to +120°C (-30°F to +250°F), Nitrile /NBR is the most widely used elastomer in the seal industry today. Also many military rubber specifications for fuel and oil resistant O-rings require nitrile based compounds.
It should be mentioned that to obtain good resistance to low temperature, it is often necessary to sacrifice some high temperature resistance. Nitrile compounds are superior to most elastomers with regard to compression set, tear, and abrasion resistance. Nitrile compounds do not possess good resistance to ozone, sunlight, or weather. They should not be stored near electric motors or other ozone generating equipment.
NBR parts should be kept from direct sunlight. However, this can be improved through compounding. NBR is the standard material for hydraulics and pneumatics. NBR resists oil-based hydraulic fluids, fats, animal and vegetable oils, flame retardant liquids (HFA, HFB, HFC), grease, water, and air. Special low-temperature compounds are available for mineral oil-based fluids. By hydrogenation, carboxylic acid addition, or PVC blending, the nitrile polymer can meet a more specified range of physical or chemical requirements. The quality of Nitrile-compounds depends on the percentage of acrylonitrile in the base polymer.
The table below shows the available datasheets for this material in pdf. Safety datasheets are available here.
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