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Threaded Flange

Threaded flanges are probably the most recognisable of all flanges due to their screw thread design that is used to connect it to the pipe. Threaded flanges, also known as screwed flanges (for obvious reasons), require a male and female thread to create a connection...

Slip On Flange

A slip-on flange can also be known as a hubbed flange, which, as the name suggests, has a hub with a very low profile. Why is this important? Because this type of ring type joint gasket has an internal diameter larger than the connecting pipe, allowing you to slide it...

Weld Neck Flange

Also known as tapered hub flanges or high hub flanges, weld neck flanges are a specific type of gasket with a protruding ridge and long neck used to connect pipework and provide you with a high-quality seal. Weld neck flanges, in particular, are a popular choice when...

Nitrile vs Viton® – What is the Difference?

As you start to make a decision about what type of O-rings to purchase for your business, you might wonder what material is the most suitable for your unique needs. Every business operation has different requirements for their O-rings, such as the temperature,...

Aflas vs Viton

When it comes to choosing O ring suppliers in the UK, you’ll find that there are a wide range of materials on offer for you to choose from. Many people find that the options can seem quite overwhelming, with some materials having similar properties but offering...

EPDM Gasket

Both the automotive and construction industries have started to use EPDM gaskets more frequently in recent times. This rubber material is UV light resistant and has many fantastic properties that make this part highly effective for a wide range of processes. Keep...

Metal Gaskets

When comparing gaskets for use within your business processes, you’ll find that these can be made from a variety of materials. Metal gaskets are a very popular option, offering many advantages over other materials. When looking at sealing product options, make sure...

AFLAS o ring

O rings come in many different dimensions, thicknesses, and materials. And it is the various different materials that o rings can be manufactured from that make each o ring unique and suitable for specific applications. In fact, there are hundreds of different types...

O Ring Vulcanization Process

With years of o ring knowledge and experience in o ring vulcanization, we're one of the leading experts in providing the right sealing solution for you. To view our full range, visit our O-ring product page, with a wide selection and something to match every...

What is a Window Seal?

A window seal is something that nearly all of us will have seen in our homes or workplaces and is designed to help make your building more comfortable. Within our range of Sealing Specialist Products, we offer a selection of window seals designed for various...

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Nitrile rubber, NBR, and Buna-N – how well do you know your o ring materials?

Nitrile rubber, NBR, and Buna-N – how well do you know your o ring materialsA widely used elastomer, Nitrile, Buna-N, or NBR rubber, are all oil and fuel resistant and provide a great level of strength, making them a popular material for seals across various industries. 

Suitable for a range of applications, this versatile rubber material, like any, comes with a range of advantages and disadvantages, which you must know about before opting for Nitrile for your application. 

Of course, specialist o ring suppliers such as Specialist Sealing Products are always on hand to provide you with further information and advice, stocking hundreds of different o rings and gaskets manufactured from varying compounds and materials. 

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Buna-N

Buna-N (most commonly known as Nitrile) is the most frequently used and most economical elastomer around.  

Resistant to fuels, petroleum-based oils, water, silicone greases, alcohols, and hydraulic fluid, this material can provide you with a whole host of benefits. 

It also works well in low compression sets and can provide users with high resistance to abrasion and tensile strength. 

NBR (Buna N) has a temperature range between -40 degrees Fahrenheit to 257 degrees Fahrenheit with a hardness range between 40 to 90 Share A. 

Note:  You can formulate NBR compounds to offer different temperature ranges, i.e., from -85 degrees Fahrenheit to 275 degrees Fahrenheit, if required, depending on use and application. 

NBR rubber properties 

Nitrile rubber is composed of copolymers (unsaturated) of 2-propenentile and butadiene monomers. Of course, Nitrile’s chemical and physical properties will vary depending on the polymer’s composition. 

It’s also important to note that the more Nitrile there is within the polymer, the higher the level of resistance it will have to oils, but the less flexibility it will be able to offer you, compared to natural rubbers, for example. 

Comparing Nitrile rubber to natural rubber further, we find that Nitrile is also more resistant to acids, oils and is stronger. 

The NBR compound formulation can comprise filler, plasticizer, antioxidant or antiozonant, zinc oxide, accelerator, and vulcanising agents. 

These elements will be used to help increase the sealing properties required from the material. 

The most commonly used is that of carbon black. Used as a filler in standard NBR compounds, depending on the volume of carbon black filler used will depend on the hardness of the final compound. 

In contrast, plasticizers will increase the processability of the compound, modifying its physical properties creating modifications that can help lower hardness, improve flexibility, and lower temperature performance. 

For most NBR compounds, sulphur is typically used as the curing agent of choice. 

When systems have been exposed to sulphur as the curing agent, vulcanising agents and accelerators will then be used to help speed up reaction rates between the sulphur and the NBR. 

For further information on sealing properties and the right material choice for your seal and application, make sure to read our latest post relating to oil seals here. 

What are NBR seals suitable for? 

NBR seals are suitable for: 

  • O rings 
  • Oil seals 
  • Gaskets 
  • Hoses 
  • Automotive transmission belts 
  • Synthetic leather 
  • Belts 
  • Printers foam rollers 
  • Disposable non-latex gloves 
  • Cable jacketing 
  • And more. 

It is also possible to use NBR latex as a pigment binder or in the preparation of adhesives. 

NBR seals are most commonly found in the automotive industry, but overall, they are a great material choice for any oil-based application. 

Used in low-temperature military applications, off-roading equipment, marine devices, aircraft fuel systems, and more. 

In addition, for NBR formulated to FDA standards, it can also increase the many ways NBR o rings can be applied. 

Advantages and disadvantages of Buna-N 

Advantages 

  • Abrasion-resistant 
  • It offers a rebound element 
  • Tear-resistant 
  • It offers excellent sealing capabilities, all at a very low cost 
  • Non-polar solvent resistant 
  • Water-resistant 
  • Provides a low compression set 
  • Has low gas permeability 
  • Oil resistant 
  • Less expensive than Fluoroelastomers. 

Disadvantages 

  • Poor resistance to sunlight, weather, and ozone 
  • Limited resistance to high temperatures 
  • Should have limited contact with highly aromatic fuels and glycol-based brake fluids 
  • Poor flame resistance. 

To find out more about Nitrile rubber and the most suitable o rings and gaskets in the UK for your application, call us today on 01535 274 776; a member of our team will be happy to help. 

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