Registration Dossier

Physical & Chemical properties

Explosiveness

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Reference
Endpoint:
explosive properties of explosives
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because there are no chemical groups present in the molecule which are associated with explosive properties
other:

Description of key information

Considering the chemical structure of the substance and taking Appendix 6 of the UN regulation for the use of screening procedures to assess explosive properties and the ECHA Endpoint specific guidance (R.7a) into consideration, zirconium dichloride oxide is considered not to contain any chemical groups indicating explosive properties.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification

Based on Column 2 of the REACH regulation on standard information requirements (Annex VII), the study does not need to be conducted if there are no chemical groups associated with explosive properties present in the molecule. Considering the chemical structure of the substance and taking Appendix 6 of the UN regulation for the use of screening procedures to assess explosive properties and the ECHA Endpoint specific guidance (R.7a) into consideration, zirconium dichloride oxide is considered not to contain any chemical groups indicating explosive properties. The above is confirmed by the DTA analysis performed for the determination of the melting point of zirconium dichloride oxide which shows limited exothermic reactions between 450 and 500°C. Although the exothermic decomposition energy could not be calculated, it was concluded to be very limited and regarded to be the typical crystallization exotherms of zirconia.

Based on the above discussion, zirconium dichloride oxide can be concluded not to be classified for explosiveness under the CLP Regulation.