What is NBR (Nitrile Butadiene Rubber)?
NBR (nitrile butadiene rubber), also known by the trade names Nitrile®
Release time:
2022-03-17
Source:
NBR (nitrile butadiene rubber), also known by the trade names Nitrile®, Perbunan®, and BUNA-N®, is a synthetic polymer made of acrylonitrile and 1,3-butadiene. It is an elastomer, a synthetic polymer made by copolymerizing acrylonitrile and 1,3-butadiene. It is a "random" copolymer, meaning that the order of the acrylonitrile and butadiene groups in the polymer chain is disordered.
What is nitrile?
More generally, NBR is a copolymer of an unsaturated nitrile (e.g., acrylonitrile or methacrylonitrile) and a diene with a double bond (e.g., 1,3-butadiene or isoprene - in the latter case, nitrile isoprene rubber or NIR). The polymer still contains a double bond and can therefore be vulcanized with sulfur to form synthetic rubber.
What is butadiene?
Buna-N is a condensation of butadiene and sodium; where N stands for nitrile. It has excellent resistance to petroleum products and can be used over a temperature range of -35°C to +120°C (-30°F to +250°F).
Nitrile/NBR Sealing Materials
Nitrile/NBR is the most commonly used elastomer in the sealing industry. NBR rubber specifications for fuel and oil resistant O-rings also require nitrile-based compounds. nds-seal also has high quality BIO-NBR qualities for biofuel applications. nbr has reasonable to good mechanical properties and is resistant to oils, fats, hydrocarbons and dilute acids. UV, weathering and ozone resistance can only be obtained by additives, so it is always a special material. It is not resistant to aromatic compounds, halogenated hydrocarbons, ketones, automotive brake fluids or strong acids. nBR materials can also be used for special low temperature applications. NBR polymers can meet more specific physical or chemical requirements through hydrogen saturation, carboxylic acid addition, or PVC blending.
Properties
The operating temperature is limited to (-40 º - 120 º) and has good compression set values. The properties of NBR are also determined by the acrylonitrile content, which is about 31% in standard NBR. More acrylonitrile improves mechanical properties and resistance to oils and fuels, but increases the temperature at which the rubber becomes brittle/reaches its glass point.
NBR Seals
NBR is the most common elastomer used for standard seals, but is often used for other types of seals as well. Nitrile compounds typically have good technical properties in terms of compression permanent deformation, tear resistance and wear resistance
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