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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


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