NITRILE RUBBER or NBR
It is a copolymer of butadiene and acrylic nitrile or acrylonitrile and is often referred to simply as nitrile rubbers. Its international abbreviation is NBR. Along with the fluorinated, the nitriles are synthetic rubbers with better resistance to oils and aliphatic hydrocarbons (hexane, heptane, methane, ethane, octane, butane, pentane) but their resistance to aromatic hydrocarbons (benzene, toluene, xylene) is limited and, even more so, against chlorinated ones (chloroform, trichlorethylene, perchlorethylene).
This resistance to oils and hydrocarbons is higher as the content of acrylonitrile increases. The fraction of polybutadiene is what gives it its elastic characteristics, while the polyacrylonitrile fraction, strongly polar, is what gives it its resistance to non-polar compounds, such as gasolines, oils and hydrocarbon solvents.
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The NBR has very good adhesion to steel. They resist acids (except oxidants), fatty acids, vegetable or animal fats and alkalis and salts. Its low permeability to air and other hydrocarbon gases such as natural gas, propane and butane is noteworthy. Its resistance to low temperatures is moderate as well as to the weather, decreasing its flexibility at low temperatures. The capacity of the NBR in support of temperatures oscillates between -40 ° C and + 100ºC.