Properties of Natural Rubber (NR)

Natural rubber (NR), derived primarily from the latex of the Hevea brasiliensis tree, is a highly elastic and durable elastomer. It exhibits excellent tensile strength, flexibility, and resilience under mechanical stress, making it ideal for industrial and engineering applications.

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The following table provides a comprehensive list of natural rubber (NR) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

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Table of Natural Rubber Properties
Physical Properties
Metric
CategoryElastomer
Density920 - 1037 kg/m3
Mechanical PropertiesMetric
Ultimate Tensile Strength29 MPa
Yield Tensile Strength17.1 - 31.7 MPa
Young’s Modulus (E)3.3 - 5.9 GPa
Poisson’s Ratio (ν)0.5
Elongation at Break660 - 850%
Shore Hardness (A)30 - 95
Thermal PropertiesMetric
Thermal Conductivity0.15 W/m·K
Specific Heat Capacity (Cp)1830 J/kg·K
Glass Transition Temperature (Tg)-70 °C
Electrical PropertiesMetric
Relative Permittivity (@1 MHz) (εr)2.6

Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)

Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) A.M. Howatson, P.G. Lun, J.D. Todd, P.D. Engineering Tables and Data. United Kingdom: University of Oxford, Department of Engineering Science, 2009.