Acetic Anhydride (C4H6O3)
Acetic anhydride, also known as ethanoic anhydride, is a chemical compound with the formula C4H6O3. It is a colorless, pungent-smelling liquid and is considered an important reagent in organic synthesis and the production of various chemicals and pharmaceuticals.
The following table provides a comprehensive list of acetic anhydride 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 | 102.09 g/mol |
| Density | 1082 kg/m3 |
| Dynamic Viscosity | 0.91 mPa·s |
| Surface Tension | 32.65 mN/m |
| Thermal Properties | Metric |
| Melting Point | -74 °C |
| Boiling Point | 139 °C |
| Thermal Conductivity | 0.164 W/m·K |
| Specific Heat Capacity (Cp) | 1830 J/kg·K |
| Coefficient of Thermal Expansion (αV) | 1.12×10-3 1/°C |
| Vapor Pressure | 0.53 kPa |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 333 °C |
| Critical Pressure (Pc) | 4 MPa |
| Critical Molar Volume (Vc) | 294 cm3/mol |
| Electrical Properties | Metric |
| Relative Permittivity (εr) | 22.45 |
| Optical Properties | Metric |
| Refractive Index (589 nm) | 1.39 |
| Hazardous Data | Metric |
| Flash Point | 49 °C |
| Autoignition Temperature | 316 °C |
| Lower Flammability Limit | 2.7% |
| Upper Flammability Limit | 10.3% |
| NFPA Rating (Health) | 3 |
| NFPA Rating (Fire) | 2 |
| 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.