Natural Rubber, Vulcanized (NR, IR, Polyisoprene)
Categories: Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)

Material Notes: Natural rubber is polyisoprene. Chemical and environmental resistance and mechanical properties are improved through crosslinking (vulcanizing), usually through treatment with sulfur.

Natural rubber usually withstands polar organic solvents (alcohols, ketones, aldehydes), organic acids, and mild chemicals. Its is adversely affected by most hydrocarbons, oil/grease/fat, strong acid, and ozone.

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Physical PropertiesMetricEnglishComments
Density 0.950 g/cc0.0343 lb/in³Uncompounded
Mechanical PropertiesMetricEnglishComments
Hardness, Shore A 30 - 10030 - 100Depends on compounding
Hardness, Shore D 30 - 4530 - 45Depends on compounding
Tensile Strength, Ultimate 28.0 MPa4060 psiCompounded Tire
Elongation at Break 100 - 800 %100 - 800 %
100% Modulus 1.50 MPa
@Strain 100 %
218 psi
@Strain 100 %
Shear Modulus 0.000500 GPa0.0725 ksi
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 1.00e+16 ohm-cm1.00e+16 ohm-cm
Dielectric Constant 2.9
@Frequency 1000 Hz
@Frequency 1000 Hz
Dielectric Strength 50.0 kV/mm1270 kV/inStep by step
Dissipation Factor  0.0020
@Frequency 60.0 - 1000 Hz
@Frequency 60.0 - 1000 Hz
@Frequency 1e+6 Hz
@Frequency 1e+6 Hz
Thermal PropertiesMetricEnglishComments
CTE, linear 225 µm/m-°C
@Temperature 20.0 °C
125 µin/in-°F
@Temperature 68.0 °F
Specific Heat Capacity 0.440 J/g-°C0.105 BTU/lb-°F
Thermal Conductivity 0.150 W/m-K1.04 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 80.0 °C176 °F
Minimum Service Temperature, Air -55.0 °C-67.0 °F
Optical PropertiesMetricEnglishComments
Refractive Index 1.5261.526

References for this datasheet.

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