Chlorine Dioxide — properties & hazards overview

Name: Chlorine dioxide Formula: ClO₂ CAS: 10049-04-4 UN: 3139 (stabilized)
DANGER — powerful oxidizer; unstable and can decompose explosively above ~10% v/v. Keep gas very dilute, generate on-site only, avoid storage/accumulation. Use alkaline reducing scrubber; prevent contact with organics.
Boiling point
~ 11 °C (decomposes)
Nature
Strong oxidizer
Stability
Explosive above ~10% v/v in air
Water solubility
Moderate (→ chlorite/chlorate)
Toxicity
high (respiratory/eye)
Flammability
not flammable; oxidizer/Expl.
Chronic risk
generally low
Environmental
oxidant; chlorite/chlorate
PropertyValue / Note
Physical stateYellow-green gas; strong odour; liquefies near ambient; decomposes when concentrated/heated.
ReactivityPowerful oxidant; violent with reducing agents/organics; explosive decomposition at elevated % v/v.
UsesBleaching, disinfection, odour control.

*Generate on-site at low concentration; design to prevent pockets/accumulation.

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