Registration Dossier

Physical & Chemical properties

Flammability

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Based on a theoretical assessment and on the observed endothermic reactions in the DTA analysis, zirconium sulfate is concluded to be non-flammable. Day-to-day handling of the substance shows that the substance is not flammable in contact with water or with air.

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

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

Pyrophoricity. In the daily use and handling of zirconium sulfate 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 this substance has pyrophoric properties.

Flammability in contact with water. Under conditions where zirconium sulfate is in contact with water no ignition and/or liberation of flammable gases is observed. The absence of structural alerts furthermore confirms that it is highly unlikely that this substance is flammable in contact with water.

Flammability. When zirconium sulfate is heated it decomposes. This decomposition becomes significant at approximately 740°C and is preceded at lower temperatures (164 / 185 °C) by dehydration. Dehydration and decomposition are endothermic reactions making the substance not liable to burning. Furthermore, inorganic sulfates in which the inorganic element is in its highest possible oxidation state are considered incapable of further reaction with oxygen and can thus be designated as non-flammable. The oxidation state of zirconium in zirconium sulfate is in its highest possible state (4+) and this substance can thus be considered as non-flammable.

Justification for classification or non-classification

Pyrophoricity. In the daily use and handling of zirconium sulfate 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 this substance has pyrophoric properties.

Flammability in contact with water. Under conditions where zirconium sulfate is in contact with water no ignition and/or liberation of flammable gases is observed. The absence of structural alerts furthermore confirms that it is highly unlikely that this substance is flammable in contact with water.

Flammability. When zirconium sulfate is heated it decomposes. This decomposition becomes significant at approximately 740°C and is preceded at lower temperatures (164 / 185 °C) by dehydration. Dehydration and decomposition are endothermic reactions making the substance not liable to burning. Furthermore, inorganic sulfates in which the inorganic element is in its highest possible oxidation state are considered incapable of further reaction with oxygen and can thus be designated as non-flammable. The oxidation state of zirconium in zirconium sulfate is in its highest possible state (4+) and this substance can thus be considered as non-flammable.

Following the above assessment it is concluded that zirconium sulfate is non-flammable and should thus not be classified for this endpoint.