Styrene Butadiene Rubber (SBR, Buna-S)
SBR rubber is a thermoset elastomer or rubber material. It has a moderately low density and a fairly high ductility among rubber materials. The graph bars on the material properties cards below compare SBR 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.
Mechanical Properties
Elongation at Break
530 %
Tensile Strength: Ultimate (UTS)
14 MPa 2.0 x 103 psi
Thermal Properties
Glass Transition Temperature
-30 °C -22 °F
Maximum Temperature: Mechanical
100 °C 210 °F
Specific Heat Capacity
1880 J/kg-K 0.45 BTU/lb-°F
Thermal Conductivity
0.17 W/m-K 0.1 BTU/h-ft-°F
Otherwise Unclassified Properties
Density
1.1 g/cm3 69 lb/ft3
Limiting Oxygen Index (LOI)
18 %
Common Calculations
Strength to Weight: Axial
3.4 points
Strength to Weight: Bending
11 points
Thermal Diffusivity
0.082 mm2/s
Followup Questions
Further Reading
Rubber Formulary, The, Peter A. Ciullo and Norman Hewitt, 1999