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Medical Grade Seals

When looking at your options for gaskets and seals, you’ll see that some products are marked as medical grade. These seals offer a range of extra benefits and features when compared to your typical seals, and they are required for many different types of processes....

O Ring Face Seals

While you may be familiar with O-rings, these come in various types, which offer benefits to a range of manufacturing applications. Sometimes called a toric joint, O-rings work to seal the area between two different joined parts. This means that even when working at...

Straight Thread Tube Fitting O-Rings

When looking at the types of O-rings on offer for your manufacturing processes, you might be wondering which would be the best solution for your unique needs. Today we’re going to take a deeper look into what straight thread tube fitting O-rings are and how we can...

Can You Use Corrugated Gaskets Instead of Spiral Wound Gaskets?

If you’ve always relied on spiral wound gaskets in the past, you might be wondering if there is an alternative option on offer. Corrugated gaskets offer many benefits over spiral wound gaskets, which is why so many companies are opting to switch between these two...

What is a Wiper Seal?

An important component that’s often overlooked by businesses and manufacturers is the wiper seal. If you are wondering what a wiper seal is, today we’re going to discover why you need to use them and how they can support your work. Go to the homepage for more...

How to Choose the Right Seal for Electric Motors

When choosing a seal for your electric motors, there are many options on the market. Finding the right electric motor shaft seal is critical to ensure your customers are happy and that your vehicles fit their needs. Keep reading to discover how to choose the right...

Why Should You Invest in Quality Seals?

While industrial seals might seem like something you could save a little money on, this is one part that we don’t recommend cutting costs on. A quality seal will offer many benefits to your business and operations, so it’s worth taking the time to find a solution...

All you need to know about Neoprene O rings

Popular in the refrigeration industry, neoprene o rings are also growing in popularity across a wide range of other sectors due to their incredible resistance to hazardous materials. Also known as chloroquine o rings, these o rings provide excellent resistance to...

Why all sealants are not the same

It's important to understand just how critical it is to use the correct type of sealant. It's especially the case when working with heavy machinery or any industrial situation. You don't want to have to worry about whether your sealing products are working correctly...

How to understand O-rings and their design

O-Rings are a critical component for the proper sealing of specific pipes. They have to sit within a specified groove, which can vary based on the hardware used. That's why it's important to note the various types of o-ring groove design to understand better what kind...

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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