When is nitrile rubber the right choice for sealing and insulation? This common elastomer is known by many names, including Buna-N, NBR, and acrylonitrile butadiene. There are plenty of trade names for nitrile, too. No matter what you call it, nitrile rubber offers good resistance to oils, fuels, and chemicals. Temperature and environmental conditions are limiting factors, however, and may require the selection of a more expensive material such as Viton™.
In this article from Elasto Proxy, you’ll learn about nitrile’s advantages and disadvantages. You’ll also examine NBR compounds, compare commercial and specialty Buna-N, and consider some typical nitrile applications. Elasto Proxy supplies specialty nitrile products to a variety of industries and can create a custom sealing solution that meets your specific requirements. Nitrile isn’t the only oil-resistant elastomer, but it’s a cost-effective choice compared to some other compounds.
Nitrile Advantages and Disadvantages
Nitrile rubber provides good-to-excellent resistance to many oils and solvents. Examples include:
- animal and vegetable oils
- crude petroleum oil
- kerosene and gasoline
- liquified petroleum (LP) gases
- motor oils
- mineral oil based hydraulic fluids
- silicone greases and oils
For engineers and buyers, it’s important to understand that nitrile’s resistance to petroleum oils is limited by temperature. According to most chemical resistance charts, nitrile resists petroleum oil at temperatures up to 250° F (121° C). If your application requires both oil resistance and higher temperature resistance, a fluorocarbon such as Viton™ may be required instead. Nitrile is also unsuitable for highly polar solvents such as acetone, which is used in some food processing and medical applications.
Nitrile’s advantages include good physical properties such as resistance to compression set, tearing, and abrasion. Typically, NBR or Buna-N comes in durometers (Shore A) ranging from 20 to 95 for applications that require a softer or harder rubber. Nitrile resists water, but provides poor resistance to weather, ozone, and aging. Acrylonitrile butadiene is also unsuitable for some applications because Buna-N won’t withstand temperatures that are colder than -40° F (-40° C).
Nitrile Compounds and Specialty Grades
Through compounding, material suppliers have developed different types of nitrile with enhanced material properties. For example, hydrogenated nitrile butadiene rubber (HNBR) can withstand slightly higher temperatures than NBR and provides improved resistance to polar fluids. Carboxylated nitrile butadiene rubber (XNBR) has a higher compression set than Buna-N and offers improved tear and abrasion resistance. Nitrile can also be blended with polymers such as polyvinyl chloride (PVC).
For engineers and buyers, choosing the right type of nitrile may involve comparing commercial rubber to specialty grades. Commercial grades generally cost less and are available in higher minimum order quantities (MOQs). Specialty grades generally cost more and have larger MOQs, but they’re custom compounds with improved properties. ASTM D2000 provides a standard way to describe elastomers and uses the designations BF, BG, BK, and CH with both standard and specialty nitrile.
Nitrile Products and Custom Fabrication
Nitrile rubber products are used in the aerospace, defense, infrastructure, medical and health, and mobile equipment industries. Specific uses include:
- floor mats
- hydraulic hoses
- lip seals
- oil seals
- vehicle transmission belts
Nitrile rubber is also used in appliance seals, medical gloves, and the bumpers for bowling alleys.
Buna-N or NBR is supplied as sheets, rolls, and profiles. Most nitrile rubber is black, but other colors are available. Nitrile seals and gaskets are usually made of solid sheets or extrusions, but closed cell Buna-N sponge rubber is used in applications that require a conformable gasket material. Water jet cutting supports fast, precise NBR gasket fabrication and eliminates the need to pay for or wait for tooling.
Find Nitrile Rubber for Sealing and Insulation
Do you need nitrile seals or gaskets? Do you have questions about Buna-N, or are you wondering whether HNBR or XNBR might be a better choice your application? Maybe you’re considering Viton™ or a specialty grade nitrile when a commercial NBR would meet your requirements. For design assistance, help with material selection, and expert gasket fabrication, contact Elasto Proxy.