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
Density
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