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Link to relevant study record(s)

Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 10 jun 2005 to 13 Oct 2005
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
EU Method A.17 (Oxidising Properties (Solids))
Version / remarks:
Cited as Directive 92/69/EEC, A.17
Deviations:
yes
Remarks:
Ignition source: use of a platinum wire heated by electrical power instead a direct flame. This modification has no effect on the conclusion.
GLP compliance:
yes
Contact with:
powdered cellulose
Key result
Sample tested:
other: test item / cellulose mixtures containing 10 to 90% test item in 10% increment weight
Parameter:
mean burning time
Remarks on result:
other: The test item did not burn.

Preliminary test:

Reference mixture (barium nitrate / cellulose - ratio 2/1) took 89 seconds to burn.

The combustion of the substance mixture (test item / cellulose - ratio 2/1) stopped immediately.

 

Main study:

Nominal proportion of test item (%)

Weight of cellulose (g)

Weight of Test item (g)

Burning time (s) / Remarks

10

13.547

1.511

Ignition by the hot wire, but no flame propagation

20

11.975

2.953

Ignition by the hot wire, but no flame propagation

30

10.524

4.465

Ignition by the hot wire, but no flame propagation

40

9.016

5.974

Ignition by the hot wire, but no flame propagation

50

7.479

7.558

Ignition by the hot wire, but no flame propagation

60

5.999

9.033

Ignition by the hot wire, but no flame propagation

70

4.485

10.487

Ignition by the hot wire, but no flame propagation

80

2.955

11.972

Ignition by the hot wire, but no flame propagation

90

1.488

13.509

Ignition by the hot wire, but no flame propagation

 

The test item did not burn.

CERIUM DIOXIDE has no oxidising properties under the conditions of the test.

Interpretation of results:
GHS criteria not met
Conclusions:
Cerium dioxide has no oxidizing properties under the conditions of the test.
Executive summary:

The determination of the oxidising properties of cerium dioxide was performed according to EU Method A17 using a powder train about 250 mm long. The test item was mixed with a combustible substance, being powdered cellulose. The test item / cellulose mixtures contained 10-90% test item in 10% increment by weight. As a reference, a baryum nitrate / cellulose mixture was prepared. A pile of each mixture is ignited with the hot wire, and the burning time is recorded. No flame propagation was observed with each mixture of test item and cellulose. So cerium dioxide has no oxidizing property.

Description of key information

Cerium dioxide has no oxidizing properties under the conditions of the test.

Key value for chemical safety assessment

Oxidising properties:
no

Additional information

The existing data only concerns the bulk form. One experimental study, scored as Klimisch 1, is available (Cerutti M., 2005) and selected as a key study.

Justification for classification or non-classification

Based on the above data, cerium dioxide does not require a classification regarding its oxidising properties, neither under DSD, nor under CLP.