Table 3.
Overview of propylene glycol physical properties
| Physical properties | Value |
|---|---|
| Color and form | Colorless, viscous and stable hygroscopic liquid |
| Odor | Odorless |
| Freezing point (oC) | -60 |
| Boiling point (oC) | 187.3 |
| Flash point (oC) | 107 |
| Specific heat at room temperature (cal/g) | 0.59 |
| Surface tension at room temperature (dynes/cm) | 0.37 |
| Solubility | Miscible with water, acetone, and chloroform; soluble in ether; miscible with water, alcohol, and many organic solvents |
| Viscosity at 20oC (Cps) | 60.5 |
| Vapor pressure at 20oC (mmHg) | 0.05 |
Adapted from Sara et al., (2016).