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Physical & Chemical properties

Flammability

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Description of key information

When [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) is heated it decomposes. This decomposition starts at approximately 25 - 50°C and results in the formation of zirconium dioxide under the release of water and carbon dioxide. Decomposition is an endothermic reaction making the substance not liable to burning. Furthermore, inorganic oxides in which the inorganic element is in its highest possible oxidation state are incapable of further reaction with oxygen and can thus be designated as non-flammable. The oxidation state of zirconium in [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) as well as in zirconium dioxide is in its highest possible state (4+) and thus [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) can be considered as non-flammable. 

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Justification for classification or non-classification

Flammability is usually seen as the ease with which the substance can burn or be ignited. However it also includes spontaneously flammability (pyrophoricity) and ignition on contact with water.

Pyrophoricity

In the daily use and handling of [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) during which continuous exposure to air can occur, no spontaneous ignition is observed. The absence of structural alerts furthermore confirms that it is highly unlikely that [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) has pyrophoric properties.

Flammability in contact with water

Under conditions where [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) is in contact with water no ignition and/or liberation of flammable gases is observed. This includes the [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) production process as this substance is routinely produced using aqueous media to slurry and transfer the material. The absence of structural alerts furthermore confirms that it is highly unlikely that [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) is flammable in contact with water.

Flammability

When [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) is heated it decomposes. This decomposition starts at approximately 25 - 50°C and results in the formation of zirconium dioxide under the release of water and carbon dioxide. Decomposition is an endothermic reaction making the substance not liable to burning. Furthermore, inorganic oxides in which the inorganic element is in its highest possible oxidation state are incapable of further reaction with oxygen and can thus be designated as non-flammable. The oxidation state of zirconium in [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) as well as in zirconium dioxide is in its highest possible state (4+) and thus [µ-[carbonato(2-)-O:O']]dihydroxydioxodizirconium (ZBC) can be considered as non-flammable.