May. 05, 2025
NBR, also known as Nitrile or Buna-N, is one of the most widely used and economical elastomers. This material offers excellent sealing capabilities at a very low cost. NBR is a copolymer of butadiene and acrylonitrile, and depending on the application, the proportions of acrylonitrile can vary from 14% to 50%. The higher acrylonitrile content, the greater resistance to oil and fuel.
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When formulating NBR compounds, filler, plasticizer, antioxidant or antiozonant, zinc oxide, accelerator, and vulcanizing agents may be used to increase specific sealing properties of the material. When it comes to filler, carbon black is typically used in standard NBR compounds. Altering the amount of carbon black will change the hardness of the final compound.
Plasticizers increase the processability and modify physical properties of the final compound. Some of the modifications include lower hardness, improved flexibility, and low temperature performance. Sulfur is commonly used as a curing agent for NBR compounds. For sulfur cure systems, vulcanizing agents and accelerators are used to speed up the reaction rate between NBR and sulfur.
NBR is an ASTM D designation. These standard compounds have a working temperature range of -40°F to 257°F and hardness range of 40 to 90 Shore A. NBR compounds can be formulated to offer additional temperature ranges from -85°F to 275°F.
NBR features excellent resistance and mechanical properties, including:
While NBR offers great resistance to many chemicals and solutions, there are some limitations to be aware of. NBR should have limited contact with:
Because of NBR’s compatibility with oils and fuels, NBR seals are commonly used in the automotive industry. However, NBR is a go-to material for oil applications of any kind. NBR is also commonly used in applications such as:
NBR can also be formulated to meet FDA standards, which increases the number of ways to apply NBR o-rings.
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Nitrile Butadiene Rubber or NBR is a popular elastomer that is produced from a copolymer of acrylonitrile and butadiene. This versatile rubber material, owing to its several superior features and properties, is widely used in a number of applications across industries. It is one of the very sought after sealing materials due to its capability to resist oil, fuel, grease, water, air and flame retardant liquids (HFA, HFB, HFC). There are several things you must know about this synthetic rubber, and this is what exactly is covered in this post.
The physical and chemical properties of NBR vary in part with the polymer’s composition of nitrile. However, the material exhibits the following properties in general.
The seals manufactured from NBR or Buna-N are the best option for applications involving highly polar solvents such as acetone, MEK, ozone, chlorinated hydrocarbons, and nitro hydrocarbons. What else add to the popularity of Nitrile Rubber seals, here they are listed;
Nitrile Rubber Seals possesses:
Due to its ability to be compounded with several other materials, Nitrile Butadiene Rubber is chosen for numerous applications, and the most important amongst them is as the sealing material. The material is used to make food grade seals, water-cut seals, oil seals, O-rings, and other industrial seals. Due to its strong resistance to heat aging and several other features listed above, Nitrile Rubber Seals are widely chosen for endless applications across industries including:
Rather than using as a sealing material, Nitrile butadiene Rubber goes into the manufacturing of:
Would you like to have seals made from this durable Nitrile Rubber for your applications? Consider sourcing the seals made from Nitrile Butadiene Rubber or NBR from trusted manufacturers who possess in-depth knowledge about sealing materials. SSP Manufacturing Inc. is one such leading names that provide NBR seals in standard and metric sizes to meet the requirements of industries. The company combines nitrile rubber with PVC to produce seals that offer better resistance to aging, flame, petrol, and ozone. These nitrile rubber seals also offer low-temperature flexibility and resilience when compared to other competitor products.
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