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Physical & Chemical properties

Flammability

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Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2010-01-26 through 2010-02-18
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.10 (Flammability (Solids))
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2009-10-29
Test procedure:
burning time (test type not further specified)
Remarks:
or specified in description of method (migrated information)
Burning time:
0 s
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record.

Preliminary test:

The test item could not be ignited with a flame. The performance of the main test was therefore not necessary.

Interpretation of results:
non flammable
Remarks:
Migrated information
Conclusions:
Preliminary test:
The test item could not be ignited with a flame. The performance of the main test was therefore not necessary.
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
Endpoint:
flammable solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
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

Description of key information

As2O3 is generally seen as non flammable and non combustible (for example according to the ATSDR Toxicological Profile on Arsenic compounds). Further, according to chemistry text books (Holleman-Wiberg, 101th Ed.) the oxidation of As stops at As2O3 and As2O5 cannot be obtained by further oxidation in air. As supporting information, even a fine powder of arsenic metal was not flammable under the conditions of an A.10 test (EC Regulation 440/2008). Testing of As2O3 for pyrophoric properties is not considered to be required, since this substance is stable at ambient temperature. This substance also does not contain any chemical groups that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (circa 20°C). Furthermore, long-term industrial experience in handling shows that the substance does not ignite in contact with air. Testing for flammability in contact with water is not considered to be required for As2O3, because the substance does not contain groups that might lead to a reaction with water or damp air, leading to the development of dangerous amounts of gas or gases which may be highly flammable. Furthermore, long-term industrial experience in practical handling of the substance shows that it does not react with water, and recent experimental testing for water solubility has also not reported any formation of gases (in accordance with section 1 of REACH Annex XI).

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Justification for classification or non-classification

 

As2O3 is generally seen as non flammable and non combustible (for example according to the ATSDR Toxicological Profile on Arsenic compounds). Further, according to chemistry text books (Holleman-Wiberg, 101th Ed.) the oxidation of As stops at As2O3 and As2O5 cannot be obtained by further oxidation in air. As supporting information, even a fine powder of arsenic metal was not flammable under the conditions of an A.10 test (EC Regulation 440/2008). Testing of As2O3 for pyrophoric properties is not considered to be required, since this substance is stable at ambient temperature. This substance also does not contain any chemical groups that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (circa 20°C). Furthermore, long-term industrial experience in handling shows that the substance does not ignite in contact with air. Testing for flammability in contact with water is not considered to be required for As2O3, because the substance does not contain groups that might lead to a reaction with water or damp air, leading to the development of dangerous amounts of gas or gases which may be highly flammable. Furthermore, long-term industrial experience in practical handling of the substance shows that it does not react with water, and recent experimental testing for water solubility has also not reported any formation of gases (in accordance with section 1 of REACH Annex XI).

In conclusion, As2O3 should not be hazard classified as a flammable solid.