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EC number: 263-372-5
CAS number: 62010-10-0
Based on a theoretical assessment and on the observed endothermic reactions in the DTA analysis, zirconium basic 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 basic 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
Flammability in contact with water. Under conditions where zirconium
basic 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 basic sulfate is heated it decomposes. This
decomposition becomes significant at approximately 600°C and is preceded
at lower temperatures (starting at around 115°C) by dehydration and
dehydroxylation. 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 basic sulfate is in its highest possible state
(4+) and this substance can thus be considered as non-flammable.
In the daily use and handling of zirconium basic sulfate during which
continuous exposure to air and/or water can occur, no spontaneous
ignition and/or liberation of flammable gases is observed.
When zirconium basic sulfate is heated it decomposes. Decomposition
being an endothermic reaction makes the substance not liable to burning.
Furthermore, zirconium in zirconium basic sulfate is in its highest
possible oxidation state (4+) and therefore considered incapable of
further reaction with oxygen.
Following the above assessment it is concluded that zirconium basic
sulfate is non-flammable and should thus not be classified for this
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