Ethanal (Acetaldehyde) — properties & hazards overview
Boiling point
≈ 20–21 °C
Flash point
≈ −38 °C (closed cup)
Vapour pressure (20 °C)
High (near 1 atm)
Water solubility
Miscible
Flammability
Very low FP; wide LEL–UEL
Toxicity
Eye/resp. irritant
Chronic risk
Sens./possible carc.
Environmental
Air VOC; biodegradable
| Property | Value / Note |
|---|---|
| Physical state | Colorless, volatile liquid with pungent/fruity odour; typically sold stabilized. |
| Density (20 °C) | ≈ 0.78 g/cm³ |
| Explosive limits | Broad (indicative); vapours heavier than air, travel to ignition source. |
| Reactivity | Readily oxidizes to acetic acid; forms bisulfite addition products; may polymerize if unstabilized. |
| Typical sources | Solvent use, resins, flavor/ fragrance manufacture, fermentation off-gas, pyrolysis off-gas. |
*Values are indicative. Always verify via the latest SDS and local regulations for design and safety.