Properties of Furan (C4H4O)
Furan is a heterocyclic organic compound with a five-membered ring structure containing four carbon atoms and one oxygen atom. It is a highly flammable, colorless liquid with a slightly sweet odor. Furan is an important chemical building block and can be found in various natural products and synthetic compounds.
The following table provides a comprehensive list of furan properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Molar Mass | 68.07 g/mol |
| Density | 938 kg/m3 |
| Dynamic Viscosity | 0.38 mPa·s |
| Thermal Properties | Metric |
| Melting Point | -85.6 °C |
| Boiling Point | 31.3 °C |
| Thermal Conductivity | 0.1262 W/m·K |
| Vapor Pressure | 65.8 kPa |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 217 °C |
| Critical Pressure (Pc) | 5.5 MPa |
| Critical Molar Volume (Vc) | 218 cm3/mol |
| Electrical Properties | Metric |
| Relative Permittivity (εr) (25°C) | 2.94 |
| Optical Properties | Metric |
| Refractive Index (589 nm) | 1.419 |
| Hazardous Data | Metric |
| Flash Point | -36 °C |
| Autoignition Temperature | 390 °C |
| Lower Flammability Limit | 2.3% |
| Upper Flammability Limit | 14.3% |
| NFPA Rating (Health) | 2 |
| NFPA Rating (Fire) | 4 |
| NFPA Rating (Reactivity) | 1 |
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) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Fire Protection Guide to Hazardous Materials, 14th Edition. United States: National Fire Protection Association, 2010.