HNBR: Hydrogenated acrylonitrile-butadiene rubber

General Properties

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HNBR

Hydrogenated acrylonitrile-butadiene rubber


Hydrogenated acrylonitrile butadiene rubber (HNBR) is a saturated (or only slightly unsaturated) copolymer of acrylonitrile and butadiene and is obtained by selective hydrogenation of the butadiene groups of NBR (see page 162). Due to fewer double bonds, it is considerably more inert than NBR.

Structural Formula


Properties

Glass Transition Temperature-30 to -10°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 Temperature465 to 480°C
Young's Modulus15 to 25 MPa
Coefficient of Linear Thermal Expansion225 to 260 *10-6/K
Specific Heat Capacity-
Thermal Conductivity-
Density0.92 to 1.00 g/cm³
MorphologyAmorphous rubber
General propertiesVery good oil and gas resistance (like for NBR). High ozone resistance. Good abrasion resistance. Higher temperature, aging and weather resistance than NBR
ProcessingCross-linking by means of sulfur, peroxides or by radiation
ApplicationsFriction linings. Seals. Cables. Profiles

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass12.40 mg
Isothermal Phase8 min / 3 min / 8 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)