Natural Rubber, Vulcanized (NR, IR, Polyisoprene)

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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 Properties	Metric	English	Comments

Density	0.950 g/cc	0.0343 lb/in³	Uncompounded

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	30 - 100	30 - 100	Depends on compounding
Hardness, Shore D	30 - 45	30 - 45	Depends on compounding
Tensile Strength, Ultimate	28.0 MPa	4060 psi	Compounded Tire
Elongation at Break	100 - 800 %	100 - 800 %
100% Modulus	1.50 MPa @Strain 100 %	218 psi @Strain 100 %
Shear Modulus	0.000500 GPa	0.0725 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	1.00e+16 ohm-cm	1.00e+16 ohm-cm
Dielectric Constant	2.9 @Frequency 1000 Hz	2.9 @Frequency 1000 Hz
Dielectric Strength	50.0 kV/mm	1270 kV/in	Step by step
Dissipation Factor	0.0020 @Frequency 60.0 - 1000 Hz	0.0020 @Frequency 60.0 - 1000 Hz
	0.030 @Frequency 1e+6 Hz	0.030 @Frequency 1e+6 Hz

Thermal Properties	Metric	English	Comments
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-°C	0.105 BTU/lb-°F
Thermal Conductivity	0.150 W/m-K	1.04 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	80.0 °C	176 °F
Minimum Service Temperature, Air	-55.0 °C	-67.0 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.526	1.526

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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P0RUB1 / 20064

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