Natural Rubber, Not Vulcanized (NR, IR, Polyisoprene)

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Natural Rubber, Not 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	0.930 g/cc	0.0336 lb/in³	Uncompounded

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	30 - 90	30 - 90	Depends on compounding
Tensile Strength, Ultimate	>= 27.6 MPa	>= 4000 psi	Reinforced
Elongation at Break	500 %	500 %	Reinforced

Electrical Properties	Metric	English	Comments
Electrical Resistivity	1.00e+15 ohm-cm	1.00e+15 ohm-cm
Dielectric Constant	2.6 @Frequency 1000 Hz	2.6 @Frequency 1000 Hz
Dielectric Strength	17.0 kV/mm	432 kV/in
Dissipation Factor	0.0020 @Frequency 1000 Hz	0.0020 @Frequency 1000 Hz

Thermal Properties	Metric	English	Comments
CTE, linear	666 µm/m-°C @Temperature 20.0 °C	370 µin/in-°F @Temperature 68.0 °F
Specific Heat Capacity	0.450 J/g-°C	0.108 BTU/lb-°F
Thermal Conductivity	0.140 W/m-K	0.972 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	50.0 °C	122 °F
Minimum Service Temperature, Air	-50.0 °C	-58.0 °F
Glass Transition Temp, Tg	-70.0 °C	-94.0 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.519	1.519

References for this datasheet.

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P0RUB0 / 20063

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