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EC number: 264-885-7
CAS number: 64417-98-7
Following criteria were applied to determine the flammability of the
very ignitable: ignition time =< 3 seconds
ignitable: 3 seconds < ignition time <= 10 seconds
non-hazardous: No combustion or Not measurable
For all 10 replicates no ignition occurred within 10 seconds, the sample
was therefore considered to be non-hazardous
Based on the chemical structure of yttrium zirconium oxide and experience in daily use it can be concluded that yttrium zirconium oxide is non flammable. This is supported by a supporting Klimisch 3 study by Akari (2005).
Testing on yttrium zirconium oxide is considered not to be required as
based on the chemical structure and experience with daily use and
handling it can be concluded that yttrium zirconium oxide is non
flammable. The study from Akari (2005) confirms the non-flammability,
however, this study was considered not entirely reliable because -
although well performed - there were too much deviations from today's
In the daily use and handling of yttrium zirconium oxide 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 yttrium zirconium oxide has pyrophoric
Flammability in contact with water
Under conditions where yttrium zirconium oxide 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 yttrium zirconium oxide is flammable in contact with water.
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
yttrium and zirconium in yttrium zirconium oxide is in its highest
possible state (4+ for zirconium and 3+ for yttrium) and thus yttrium
zirconium oxide can be considered as non-flammable.
The oxidation state of zirconium and yttrium in yttrium zirconium oxide
is in its highest possible state (4+ for zirconium and 3+ for yttrium)
and thus yttrium zirconium oxide can be considered as non-flammable and
not sensitive to self-heating.
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