NBR: Acrylonitrile-butadiene rubber

General Properties

Short Name:

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NBR

Acrylonitrile-butadiene rubber


Acrylonitrile butadiene rubber (NBR) is obtained by copolymerization of acrylonitrile (ACN, the content varies between approx. 20 to 50% in commercial products) and 1,3 butadiene. The ACN content significantly influences the properties of the NBR vulca- nizate. Carbon black is often used as fi ller material. Just like NR, CR or SBR, NBR belongs to the R group of rubbers, i.e., to the group with an unsaturated hydrogen carbon chain (classification in accordance with ISO 1629 or ASTM D1418).

Structural Formula


Properties

Glass Transition Temperature-44 to 5°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Temperature-
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Enthalpy-
Decomposition Temperature450 to 475°C
Young's Modulus2 to 5 MPa
Coefficient of Linear Thermal Expansion150 to 180 *10-6/K
Specific Heat Capacity1.93 to 1.96 J/(g*K)
Thermal Conductivity-
Density1.00 g/cm³
MorphologyAmorphous rubber
General propertiesGood abrasion resistance. Good temperature resistance. Very good resistance to fuels, mineral oils, lubricating greases, vegetable and animal fats and oils
ProcessingCross-linking by means of sulfur (with accelerator)
ApplicationsApparatus engineering (e.g., seals, O-rings). Automobile industry (e.g., brake pads, clutches). Packaging industry. Rubber gloves

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass11.47 mg
Isothermal Phase7 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)