Properties of Triethylene Glycol (C6H14O4)
Triethylene glycol (TEG) is a colorless, odorless, and hygroscopic liquid compound with the chemical formula C6H14O4. It belongs to the glycol family of chemicals and is commonly used as a dehydrating agent and coolant in various industrial applications.
The following table provides a comprehensive list of triethylene 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 | 150.17 g/mol |
| Density | 1125 kg/m3 |
| Dynamic Viscosity | 49 mPa·s |
| Surface Tension | 45.2 mN/m |
| Thermal Properties | Metric |
| Melting Point | -7 °C |
| Boiling Point | 287 °C |
| Thermal Conductivity (25°C) | 0.195 W/m·K |
| Specific Heat Capacity (Cp) | 2162 J/kg·K |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 502 °C |
| Critical Pressure (Pc) | 3.3 MPa |
| Critical Molar Volume (Vc) | 454 cm3/mol |
| Electrical Properties | Metric |
| Relative Permittivity (εr) | 23.69 |
| Optical Properties | Metric |
| Refractive Index (589 nm) | 1.456 |
| Hazardous Data | Metric |
| Flash Point | 177 °C |
| Autoignition Temperature | 371 °C |
| Lower Flammability Limit | 0.9% |
| Upper Flammability Limit | 9.2% |
| NFPA Rating (Health) | 1 |
| 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.