Properties of Ethylene Glycol (C2H6O2)
Ethylene glycol is a colorless, odorless organic compound with the chemical formula C2H6O2. It is commonly used as an antifreeze in automotive and industrial cooling systems to prevent freezing and overheating.
The following table provides a comprehensive list of ethylene glycol 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 | 62.07 g/mol |
| Density | 1114 kg/m3 |
| Dynamic Viscosity | 18.376 mPa·s |
| Surface Tension | 48.49 mN/m |
| Thermal Properties | Metric |
| Melting Point | -13 °C |
| Boiling Point | 197.3 °C |
| Thermal Conductivity (25°C) | 0.254 W/m·K |
| Specific Heat Capacity (Cp) | 2433 J/kg·K |
| Coefficient of Thermal Expansion (αV) | 6.26×10-4 1/°C |
| Vapor Pressure (25°C) | 0.01 kPa |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 445 °C |
| Critical Pressure (Pc) | 8.1 MPa |
| Critical Molar Volume (Vc) | 180 cm3/mol |
| Electrical Properties | Metric |
| Relative Permittivity (εr) | 41.4 |
| Optical Properties | Metric |
| Refractive Index (589 nm) | 1.4318 |
| Hazardous Data | Metric |
| Flash Point | 111 °C |
| Autoignition Temperature | 398 °C |
| Lower Flammability Limit | 3.2% |
| Upper Flammability Limit | 22% |
| NFPA Rating (Health) | 2 |
| NFPA Rating (Fire) | 1 |
| NFPA Rating (Reactivity) | 0 |
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.