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Chloroprene Rubber (CR, Neoprene)

CR rubber is a thermoset elastomer or rubber material. It has the lowest heat capacity and a moderately low tensile strength among rubber materials. The graph bars on the material properties cards below compare CR 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

380 %

Tensile Strength: Ultimate (UTS)

11 MPa 1.5 x 103 psi

Thermal Properties

Glass Transition Temperature

-45 °C -49 °F

Maximum Temperature: Autoignition

410 °C 760 °F

Maximum Temperature: Decomposition

350 °C 650 °F

Maximum Temperature: Mechanical

130 °C 260 °F

Specific Heat Capacity

1120 J/kg-K 0.27 BTU/lb-°F

Thermal Conductivity

0.19 W/m-K 0.11 BTU/h-ft-°F

Otherwise Unclassified Properties


1.5 g/cm3 94 lb/ft3

Limiting Oxygen Index (LOI)

26 %

Common Calculations

Strength to Weight: Axial

1.9 points

Strength to Weight: Bending

7.1 points

Thermal Diffusivity

0.11 mm2/s

Followup Questions

Further Reading

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