Properties of Dimethyl Sulfoxide (C2H6OS)
Dimethyl sulfoxide, often abbreviated as DMSO, is a colorless liquid organic compound with the chemical formula C2H6OS. It is known for its unique properties as a powerful solvent that can penetrate biological membranes and skin. DMSO is used as a solvent for a wide range of organic and inorganic compounds, and it has applications in various fields, including medicine, pharmaceuticals, and the chemical industry.
The following table provides a comprehensive list of dimethyl sulfoxide properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
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| Physical Properties | Metric |
|---|---|
| Molar Mass | 78.14 g/mol |
| Density | 1100 kg/m3 |
| Dynamic Viscosity | 2.47 mPa·s |
| Surface Tension | 43.5 mN/m |
| Thermal Properties | Metric |
| Melting Point | 18.5 °C |
| Boiling Point | 189 °C |
| Thermal Conductivity | 0.1567 W/m·K |
| Specific Heat Capacity (Cp) | 1960 J/kg·K |
| Vapor Pressure | 0.056 kPa |
| Critical Constants | Metric |
| Critical Temperature (Tc) | 434 °C |
| Critical Pressure (Pc) | 4.6 MPa |
| Critical Molar Volume (Vc) | 228 cm3/mol |
| Electrical Properties | Metric |
| Relative Permittivity (εr) | 47.24 |
| Optical Properties | Metric |
| Refractive Index (589 nm) | 1.478 |
| Hazardous Data | Metric |
| Flash Point | 95 °C |
| Autoignition Temperature | 215 °C |
| Lower Flammability Limit | 2.6% |
| Upper Flammability Limit | 42% |
| NFPA Rating (Health) | 2 |
| NFPA Rating (Fire) | 2 |
| 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)