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.
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).
Click on the button to switch between Metric and Imperial units.
Physical Properties | Metric |
---|---|
Category | Elastomer |
Density | 920 - 1037 kg/m3 |
Mechanical Properties | Metric |
Ultimate Tensile Strength | 29 MPa |
Yield Tensile Strength | 17.1 - 31.7 MPa |
Young’s Modulus (E) | 3.3 - 5.9 GPa |
Poisson’s Ratio (ν) | 0.5 |
Elongation at Break | 660 - 850% |
Shore Hardness (A) | 30 - 95 |
Thermal Properties | Metric |
Thermal Conductivity | 0.15 W/m·K |
Specific Heat Capacity (Cp) | 1830 J/kg·K |
Glass Transition Temperature (Tg) | -70 °C |
Electrical Properties | Metric |
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)
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.