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Physical & Chemical properties


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Description of key information

Aqueous solution (as generated in-situ): not considered to be explosive, but potential hazard if off-gassing.

Key value for chemical safety assessment

non explosive

Additional information

The properties of gaseous chlorine dioxide are discussed because, although the substance as registered is in-situ generated aqueous solution, under certain conditions off-gassing may occur. Thus, the properties of gaseous chlorine dioxide, as well as the properties of the aqueous solution are important.

An experimental, non-standard, study is available, as well as numerous literature data regarding explosive properties of chlorine dioxide gas and safe management. The gas is well-known to be sensitive to various sources of ignition (heat, light, shock, and in particular sparks), and is characterised by an induction period.

Water was shown to be a good inhibitor, and diluted aqueous solutions are considered to be stable. Partial pressure of ClO2 over the solution, and therefore potential hazard, is a function of concentration and temperature (please refer to points 4.6 and 4.13).

Justification for classification or non-classification

The gas has a Harmonised Classification as Oxidising, therefore it does not need to be classified in any other hazard class.

For chlorine dioxide in aqueous solution, no physical hazard is established in the harmonised entry. However, based on the potential hazard if off-gassing, the EUH018 phrase will be proposed.