Cerium dioxide

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable 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.10 (Flammability (Solids))

Version / remarks:

Cited as Directive 92/69/EEC, A.10

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

Key result

Test procedure:

burning rate test over 100 mm length

Remarks on result:

other: substance does not ignite and propagate combustion along 100 mm of the powder train within the 2 minutes test period

The test item didn't burn. No further testing was required.

Interpretation of results:

GHS criteria not met

Conclusions:

Cerium dioxide is not highly flammable under the conditions of test.

Executive summary:

The determination of the flammability of cerium dioxide was performed using a powder train about 250 mm long, according to EU Method A10 under GLP compliance. The test item didn't burn. No further testing was required. Cerium dioxide is not highly flammable under the conditions of test.

Reference 2

Endpoint:

pyrophoric 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 known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water

Description of key information

The bulk form of cerium dioxide has no flammable properties.

Key value for chemical safety assessment

Flammability:

not classified

Additional information

Flammability: 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 flammable properties.

Pyrophoricity and flammability in contact with water: Based on the absence of structural alerts and on the knowledge from use and handling, it is unlikely that the bulk form of cerium dioxide shows such 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 flammable properties under CLP.