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Reference
Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23 August 2012 - 28 August 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.
Qualifier:
according to guideline
Guideline:
other: Test O.1 of the United Nations Recommendations on the Transport of Dangerous Goods Manual of Tests and Criteria, 5th revised edition 2009
Deviations:
yes
Remarks:
see below
Qualifier:
according to guideline
Guideline:
other: Section 2.14 of Regulation (EC) No 1272/2008 of 16 December 2008 on Classification Labelling and Packaging of Substances and Mixtures.
Deviations:
no
Principles of method if other than guideline:
The electrical resistance of the ignition wire used was 3.9 Ω/m, rather than the electrical resistance of 6.0 ± 0.5 Ω/m specified in the Method O.1. However, the material (Nickel/Chromium), length (30 cm) and diameter (0.6 mm) of the wire met the method specifications. In addition, the appropriate combination of current and voltage was used to ensure that the electrical power dissipation in the wire (150 ± 7 W) also met the method specifications. Therefore, as the physical parameters of the wire and the power dissipation (i.e. the heat applied to the test) meet the method specifications, the deviation from the electrical resistance of the wire had no effect on the test.
GLP compliance:
yes (incl. QA statement)
Contact with:
powdered cellulose
Duration of test (contact time):
141 s
Key result
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
341 s
Key result
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
141 s

Table 1 The Results of the Reference Mixture of Potassium Bromate and Cellulose in the Ratio of 3:7 (by Mass)

Test Number

Burning Time (s)

Observations

1

94

The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue.

2

91

The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue.

3

110

The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue.

4

102

The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue.

5

95

The cone burned with a yellow flame producing sparks and grey smoke, leaving a grey/black residue.

Mean burning time (s) = 98

Room temperature: 20 - 21 °C

 

Table 2 The results of the Test Material and Cellulose Mixture in the Ratio of 4:1 (By Mass)

Test Number

Burning Time (s)

Observations

1

103

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving partially black charred remains. The cone had not completely combusted.

2

100

The cone ignited with a small yellow flame and no sparks. The flame self-extinguished leaving a partially charred residue. A large portion of the cone did not combust.

3

150

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving a partially charred black residue. Some smouldering and grey smoke was observed. The cone had not completely combusted.

4

191

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving a partially charred black residue. Some smouldering and grey smoke was observed. The cone had not completely combusted.

5

163

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving a partially charred black residue. Some smouldering and grey smoke was observed. The cone had not completely combusted.

Mean burning time (s) = 141

Room temperature: 20 - 21 °C

 

Table 3 The results of the Test Material and Cellulose Mixture in the Ratio of 1:1 (By Mass)

Test Number

Burning Time (s)

Observations

1

425

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving some black charred residues. The cone had not completely combusted. Some grey smoke was observed.

2

323

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving some black charred residues. The cone had not completely combusted. Some grey smoke was observed.

3

362

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving some black charred residues. The cone had not completely combusted. Some grey smoke was observed.

4

291

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving some black charred residues. The cone had not completely combusted. Some grey smoke was observed.

5

303

The cone ignited with a yellow flame and no sparks. The flame extinguished leaving some black charred residues. The cone had not completely combusted. Some grey smoke was observed.

Mean burning time (s) = 341

Room temperature: 22 °C

 

Discussion

The ignition wire broke during each of the tests for the mixtures of test material and cellulose. Breaking of the ignition wire often occurs with test material and cellulose mixtures but this is not the case for the reference mixtures. Test O.1 states that if the wire breaks during the test, then the test should be repeated unless the wire breaking clearly does not affect the result. In each case that the wire broke, it was judged not to have affected the test.

As the mean burning times for the mixtures of test material and cellulose were greater than the mean burning time for the 3:7 (by mass) mixture of potassium bromate and cellulose, it was not necessary to determine the mean burning times for the faster burning reference mixtures.

Interpretation of results:
other: Not classified according to EU criteria.
Conclusions:
Under the conditions of this study, the test material is not an oxidising solid. It requires no classification in accordance with either the UN or CLP regulations. 
Executive summary:

The oxidising properties of the test material were investigated in accordance with the standardised guidelines Test O.1 of the United Nations Recommendations on the Transport of Dangerous Goods Manual of Tests and Criteria, 5th revised edition 2009 and Section 2.14 of Regulation (EC) No 1272/2008 of 16 December 2008 on Classification Labelling and Packaging of Substances and Mixtures.

The burning time of mixtures of the test material with cellulose in the ratios of 4:1 and 1:1 (by mass) were determined and compared to the burning rate of a reference material. The reference was potassium bromate and cellulose mixed in a ratio of 3:7 (by mass).

The mean burning times of the 4:1 and 1:1 (by mass) mixtures of the test material and cellulose were 141 and 341 seconds, respectively. The mean burning time of the reference substance was 98 seconds.

Therefore, under the conditions of this study, the test material is not an oxidising solid. It requires no classification in accordance with either the UN or CLP regulations. 

Description of key information

The test material is not an oxidising solid. 

Key value for chemical safety assessment

Oxidising properties:
no

Additional information

The oxidising properties of the test material were investigated in line with GLP and in accordance with the standardised guidelines Test O.1 of the United Nations Recommendations on the Transport of Dangerous Goods Manual of Tests and Criteria, 5th revised edition 2009 and Section 2.14 of Regulation (EC) No 1272/2008 of 16 December 2008 on Classification Labelling and Packaging of Substances and Mixtures. It was assigned a reliability score of 1 in accordance with the criteria detailed by Klimisch (1997).

The burning time of mixtures of the test material with cellulose in the ratios of 4:1 and 1:1 (by mass) were determined and compared to the burning rate of a reference material. The reference was potassium bromated and cellulose mixed in a ratio of 3:7 (by mass).

The mean burning times of the 4:1 and 1:1 (by mass) mixtures of the test material and cellulose were 141 and 341 seconds, respectively. The mean burning time of the reference substance was 98 seconds.

Therefore, under the conditions of this study, the test material is not an oxidising solid. It requires no classification in accordance with either the UN or CLP regulations. 

Justification for classification or non-classification

Based on the above data, dierbium trioxide does not require a classification regarding its oxidising properties, neither under DSD, nor under CLP or UN GHS.