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	Original Value	Comments

Density	0.930 g/cc	Uncompounded

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

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

Thermal Properties	Original Value	Comments
CTE, linear	370 µin/in-°F @Temperature 20.0 °C
Specific Heat Capacity	0.450 J/g-°C
Thermal Conductivity	0.140 W/m-K
Maximum Service Temperature, Air	50.0 °C
Minimum Service Temperature, Air	-50.0 °C
Glass Transition Temp, Tg	-70.0 °C

Optical Properties	Original Value	Comments
Refractive Index	1.519

References for this datasheet.

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P0RUB0 / 20063

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