What is Nitrile / NBR Rubber?

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.

Category: Rubber moulding, Technical Features

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Nitrile, Buna-N or NBR rubber is a widely used elastomer, thanks in large part to its highly oil & fuel resistant properties and tensile strength. In this article, Martin&#;s Rubber Company explains more about the properties, applications, pros and cons of this versatile rubber material.   Nitrile rubber is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene that you may know better under trade names like Nipol, Krynac and Europrene N. Why might you consider specifying nitrile for your application? Let&#;s find out, with a closer inspection of this rubber material.

What is Buna-N?

Nitrile (also known as NBR rubber and Buna-N) is the seal industry&#;s most widely used and economical elastomer. This is partly because it displays excellent resistance to petroleum-based oils, fuels, water, alcohols, silicone greases, hydraulic fluids. However, it also has a good balance of desirable working properties like low compression set, high abrasion resistance and high tensile strength.

NBR rubber properties

Nitrile is a family of unsaturated copolymers of 2-propenenitrile and butadiene monomers (1,2-butadiene and 1,3-butadiene). Its physical and chemical properties vary depending on the polymer&#;s composition of nitrile. The more nitrile there is within the polymer, the higher its resistance to oils but the lower its flexibility. Nitrile rubber is more resistant than natural rubber to oils and acids, and has superior strength, but suffers from inferior flexibility.

Where is nitrile used?

Nitrile rubber is used in a wide variety of applications, such as O-rings, gaskets, oil seals, automotive transmission belts, hoses, V belts, synthetic leather, disposable non-latex gloves, printer&#;s form rollers and cable jacketing. NBR latex can also be used in the preparation of adhesives or as a pigment binder.

Pros and cons of Buna-N

Nitrile offers the following advantages:

• Excellent abrasion resistance.
• Good rebound.
• Good tear resistance.
• Good non-polar solvent resistance.
• Good water resistance.
• Good oil resistance.
• Cheaper than fluoroelastomers

Nitrile suffers from the following disadvantages:

• Poor ozone, sunlight, and weather resistance.
• Limited high temperature resistance.
• Poor flame resistance.

Nitrile rubber products from Martin&#;s Rubber

Speak to one of our advisers today to find out more about our nitrile rubber manufacturing capabilities. We can talk you through your options and give you honest and informed guidance to help you to specify the ideal product for your application. Speak to us today on 023 or [ protected]. For more information on why nitrile rubber is so popular for heat resistance, see our post: Why Buna N is so popular for use with hydrocarbons.

The post The pros and cons of nitrile rubber, NBR or Buna-N appeared first on Martin&#;s Rubber Company.

Are you interested in learning more about Nitrile rubber NBR? Contact us today to secure an expert consultation!