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Diss Factsheets

Physical & Chemical properties

Oxidising properties

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Endpoint:
oxidising solids
Type of information:
other: read-across study
Adequacy of study:
supporting study
Study period:
2009-07-14 to 2009-07-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2004-09-06
Contact with:
powdered cellulose
Duration of test (contact time):
<= 3 min
Sample tested:
reference: 3:2 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
21 s
Remarks on result:
other: mean of five tests
Sample tested:
reference: 2:3 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
66 s
Remarks on result:
other: mean of five tests
Sample tested:
reference: 3:7 mixture potassium bromate + cellulose
Parameter:
mean burning time
Result:
128 s
Remarks on result:
other: mean of five tests
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
221 s
Remarks on result:
other: mean of five tests
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
323 s
Remarks on result:
other: mean of five tests

Due to the fact that both mixtures of the test item with cellulose (4:1 and 1:1) have higher mean burning times compared to the reference mixture in the ratio 3:7, it is concluded that the test item has no oxidizing properties.

Interpretation of results:
GHS criteria not met
Conclusions:
The test item molybdenum trioxide does not meet the classification criteria for oxidizing properties in the sense of the Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, Part 34.4.1 (Test O.1).
The test item molybdenum trioxide does not meet the classification criteria for oxidizing properties in accordance with Regulation (EC) No. 1272/2008 on the classification, labelling and packaging of substances and mixtures ("CLP Regulation").
Endpoint:
oxidising solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is incapable of reacting exothermically with combustible materials

Description of key information

Molybdenum dioxide has no oxidising properties.

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Justification for classification or non-classification

Read-across from MoO3 to MoO2. In a test for oxidising properties with pure molybdenum oxide (MoO3), both mixtures of the test item MoO3 with cellulose (4:1 and 1:1) had higher mean burning times compared to the reference mixture in the ratio 3:7. It is concluded that the test item pure MoO3 has no oxidizing properties.

Read-across is possible from pure MoO3 to MoO2, since MoO2 contains molybdenum in a lower oxidation state than MoO3 and a lower mass fraction of oxygen. Based on this it appears scientifically implausible, that molybdenum dioxide would exhibit oxidising properties which would be sufficient for classification, as the comparable compounds MoO3 does not.