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EC number: 238-694-4
CAS number: 14644-61-2
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.
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.
Following the above assessment it is concluded that zirconium sulfate is
non-flammable and should thus not be classified for this endpoint.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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