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EC number: 264-885-7
CAS number: 64417-98-7
- Deduction of melting point: During the preliminary and main tests, no
endothermic heat effect was observed; thus, preventing to deduce a
- Appearance and weight of the test item: After both tests, the sample
was still a white powder, loosing about 0.4 and 0.3% of its mass in
preliminary and main tests respectively.
The melting point of yttrium oxide was assessed using a thermal
analysis, according to OECD Guideline 102. A test item amount of 16.82
mg was heated up from 25°C to 400°C at a rate of 20°C/min during a
preliminary test. The quantities of heat absorbed or released were
measured by Differential Scanning Calorimeter and recorded. In this
test, no peak was observed, and the melting point of the sample could
not be deduced. The thermal analysis was thus repeated in a main test,
using 22.5 mg of test item in the same temperature range, but with the
rise adjusted to 10°C/min. No endothermic reaction could be observed. In
conclusion, yttrium oxide does not melt under the conditions of the test.
No key information is available on the melting point of yttrium zirconium oxide, however, based on a weight of evidence approach using melting point data for the individual substances zirconium dioxide (around 2700°C, Lide, 2001; O'Neil, 2006) and yttrium oxide (> 400°C, Weissenfeld, 2006), the melting point of yttrium zirconium oxide can be expected to be at least > 400°C, being environmentally irrelevant.
1. Information on zirconium dioxide (CAS# 1314-23-4)
Two values (Lide, 2001; O'Neil, 2006) are available, i.e., 2710 and
2680°C. It can be safely concluded that the melting point of zirconium
dioxide is approximately 2700°C, making it environmentally irrelevant.
2. Information on yttrium oxide (CAS# 1314-36-9)
A value for the melting point of the substance was obtained from an OECD
102 study. Yttrium oxide did not melt under the conditions of the test.
The melting point of the substance is reported to be > 400°C
3. Conclusion on yttrium zirconium oxide (CAS# 64417-98-7)
It is expected that the substance has a similarly high melting point as
the read across substances zirconium dioxide and yttrium oxide (i.e., at
least > 400°C). No exact value can be derived, however, this is not
necessary as the high melting point is environmentally irrelevant.
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