Cerium dioxide

Oxidising properties

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 for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

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 under GLP compliance 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 properties.

Description of key information

The bulk form of cerium dioxide has no oxidizing properties under the conditions of the test.

Key value for chemical safety assessment

Oxidising properties:

non oxidising

Additional information

One experimental study, scored as Klimisch 1, is available and selected as a key study. It reveals that the bulk form of cerium dioxide has no oxidizing properties.

Justification for classification or non-classification

Based on the above data, the bulk form of cerium dioxide does not require a classification regarding its oxidising properties under CLP.