Nitrile Rubber (NBR, Acrylonitrile-Butadiene Rubber)
Categories: Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes: Nitrile Rubbers are copolymers of butadiene and acrylonitrile. The term has also been applied to copolymers of other dienes and/or nitriles. Acrylonitrile content may range from 18-50%. Increasing acrylonitrile content leads to higher hardness, strength, abrasion resistance, heat resistance, and oil/fuel resistance and lower resilience and low temperature flexibility. NBR is generally damaged by ozone, chlorinated solvents, ketones, aldehydes, esters, and nitrogen-containing solvents.
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Physical PropertiesMetricEnglishComments
Density 1.00 g/cc0.0361 lb/in³Base Elastomer
 1.15 - 1.35 g/cc0.0415 - 0.0488 lb/in³Compounded
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore D 30 - 9530 - 95Depends on compounding
Tensile Strength, Ultimate 6.89 - 24.1 MPa1000 - 3500 psiReinforced
 0.896 MPa
@Temperature 204 °C		130 psi
@Temperature 400 °F
 4.83 MPa
@Temperature 121 °C		700 psi
@Temperature 250 °F
Elongation at Break 400 - 600 %400 - 600 %Reinforced
 20 %
@Temperature 204 °C		20 %
@Temperature 400 °F
 120 %
@Temperature 121 °C		120 %
@Temperature 250 °F
100% Modulus 3.00 MPa
@Strain 100 %		435 psi
@Strain 100 %		200 mm/min
Compression Set 5.0 %5.0 %
 
Thermal PropertiesMetricEnglishComments
CTE, linear 702 µm/m-°C
@Temperature 20.0 °C		390 µin/in-°F
@Temperature 68.0 °F
Maximum Service Temperature, Air 120 °C248 °F
Minimum Service Temperature, Air -30.0 °C-22.0 °F
Brittleness Temperature -51.1 °C-60.0 °F
Glass Transition Temp, Tg -38.0 °C-36.4 °FTypical of rubber with 18% ACN content
 -2.00 °C28.4 °FTypical of rubber with 50% ACN content

References for this datasheet.

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