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| Appearance | : | Colorless |
| Boiling Point | : | 21°C (70°F) at 1,013 hPa (760 mmHg) |
| DOT | : | UN1089, Acetaldehyde, 3, P.G. I |
| Flash Point | : | -40°C (-40°F) closed cup |
| Melting/Freezing Point | : | -125°C (-193°F) |
| Partition coefficient: n-octanol/water | : | log Pow: 0.5 |
| Physical State | : | Clear Liquid |
| Relative Density | : | 0.785 g/cm3 |
| Relative Vapor Density | : | 1.52 - (Air = 1) |
| Upper/lower flammability or explosive limits | : | Upper explosion limit: 60 %(V), Lower explosion limit: 4 %(V) |
| Vapor Density | : | 1.52 - (Air = 1) |
| Vapor Pressure | : | 1,008.5 hPa (756.4 mmHg) at 20°C (68°F) 1,451 hPa (1,088 mmHg) at 30°C (86°F) 2.660 hPa (1,995 mmHg) at 55°C (13°F) |
| Water Solubility | : | Completely soluble |
| pH | : | 5 at 20°C (68°F) |