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Acrylonitrile (Nitrile) Butadiene Rubber (NBR, Buna-N)

NBR rubber is a thermoset elastomer or rubber material. It has the highest thermal conductivity and a moderately high tensile strength among rubber materials. The graph bars on the material properties cards below compare NBR rubber to other rubber materials (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Thermal Properties

Glass Transition Temperature

-30 °C -22 °F

Maximum Temperature: Mechanical

110 °C 230 °F

Specific Heat Capacity

1350 J/kg-K 0.32 BTU/lb-°F

Thermal Conductivity

0.25 W/m-K 0.14 BTU/h-ft-°F

Other Material Properties


1.3 g/cm3 78 lb/ft3

Elongation at Break

380 %

Tensile Strength: Ultimate (UTS)

18 MPa 2.5 x 103 psi

Common Calculations

Strength to Weight: Axial

3.9 points

Strength to Weight: Bending

12 points

Thermal Diffusivity

0.15 mm2/s

Followup Questions

Further Reading

Rubber Formulary, The, Peter A. Ciullo and Norman Hewitt, 1999