10 Questions You Should to Know about Nitrile rubber NBR

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.

Trade Names: Buna-N, Chemigum (Goodyear), Ny Syn (Copolymer), Krynac (Polysar), Hycar (Zeon Chemical), Paracril (Uniroyal), Perbunan (Mobay)

Nitrile (Buna-N) is the most widely used general-purpose elastomer in the industry used in a variety of products such as nitrile gloves, o-rings, gaskets, and many more. This elastomer is manufactured by combining acrylonitrile and butadiene. Its physical and chemical properties vary depending on the composition of the elastomer. Nitrile (Buna-N) is resistant to petroleum and oil products, superior compression set, tear, and abrasion resistance. However, it does not wear very well in sunlight or ozone Nitrile isn&#;t known to have the greatest chemical resistance but is known to have excellent petroleum and oil resistance. In addition to resistance, it has good tolerance to some acids, fats, hydrocarbons, and more.

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The standard temperature range on Nitrile is -40ºF (-40ºC) up to +250ºF (121ºC) and can withstand dry heat up to 275ºF (135ºC). APG stocks durometers 40, 50, 70, 80, 90, and 95. If you need something softer or harder, please contact us. When stored properly, Nitrile can last up to 15 years without degradation of the compound. This material is color coded to be black however, if needed, these rubber rings can be custom ordered to be any color you may like.

Advantages

General Purpose

Nitrile tends to be a popular set material for a wide range of applications. This material is both economical and versatile as it has an excellent compression set, good tensile strength, and is widely used in both industrial and domestic applications. APG stocks a large selection of these general purpose rings such as -472, -129. and -230

Oil & Petroleum

One of the industries that use this material is the oil and petroleum industry. Nitrile has good resistance to most oils, crude, gasoline, and petroleum. Based on the amount of acrylonitrile, the nitrile elastomer has more or less oil & petroleum resistance. The more acrylonitrile, the more resistant this material is to swelling or warping when used in petroleum-based applications. Buna&#;s ability to resist many types of fluids makes it a widely used inside places like fuel tanks, automotive, marine, and even aerospace-based applications. With these great benefits, it is easy to see why Nitrile (Buna) is so widely used in many different industries.

Disadvantages

UV Light, Ozone, Weather

Nitrile has many uses however, being an outdoor sealing solution should not be one of those solutions. Due to the poor performance in UV light, ozone, and weather, this material should not be used for outdoor purposes. Nitrile also has poor steam performance and doesn&#;t have a wide temperature range such as other materials. The best materials to combat UV, ozone, and weathering are  PTFE and Aflas

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