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Physical & Chemical properties

Oxidising properties

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Endpoint:
oxidising solids
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2018-05-07 to 2018-05-17
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
UN Manual of Tests and Criteria: Test O.1 (Test for oxidizing solids)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Specific details on test material used for the study:
Substance H4 HD granules about 0.8 - 4 mm
Contact with:
powdered cellulose
Duration of test (contact time):
> 180 s
Key result
Sample tested:
4:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
> 180 s
Key result
Sample tested:
1:1 sample-to-cellulose ratio
Parameter:
mean burning time
Result:
> 180 s

Residual moisture

- The test item contained a residual moisture of <0.1 wt.-%, which was determined by drying at 50 °C under vacuum.

- The reference item potassium bromate contained a residual moisture of <0.1 wt.-%, which was determined by drying at 65 °C.

- The reference item cellulose contained a residual moisture of 4.6 wt.-%, which was determined by drying at 105 °C.

Oxidizing properties

Table 1: Burning times of reference mixture of potassium bromate and cellulose

Potassium bromate – cellulose

Test 1 / s

Test 2 / s

Test 3 / s

Test 4 / s

Test 5 /s

Average / s

3:7

131

131

135

129

137

133

The tests with the mixtures potassium bromate and cellulose in the ratios of 2:3 and 3:2 were not performed, because the burning time of the mixtures of the test item with cellulose was higher than the burning time of the reference mixture 3:7.

Table 2: Burning times of the mixtures of the test item and cellulose

Test item – cellulose

Test 1 / s

Test 2 / s

Test 3 / s

Test 4 / s

Test 5 / s

Average / s

4:1

>180

>180

>180

>180

>180

>180

1:1

>180

>180

>180

>180

>180

>180

A study was performed according to UN Test Methods O.1 in order to determine the oxidising properties of the solid test item. The test item was sieved and dried at 50 °C under vacuum until constant weight. The combustible substance - cellulose, was dried at 105 °C until constant weight. As a reference substance potassium bromate was used. The test item was mixed with cellulose in 4:1 and 1:1 ratios. The mixtures were formed into a truncated conical pile, with a base diameter of 70 mm, covering the looped ignition wire resting on the reaction plate. Power was applied to the ignition wire and was maintained for the duration of the test or for 3 min if the mixture did not ignite and burn during this time. The burning time was recorded from when the power was switched on until the main reaction ended. The test item-cellulose mixture did not ignite in both 4:1 and 1:1 ratios within 3 min. Therefore, the test item was not considered to be classified as oxidising solid according to Division 5.1 of UN Transport Regulation, GHS and Regulation (EU) No. 1272/2008, Annex1: 2.14.

Interpretation of results:
GHS criteria not met
Conclusions:
The burning time of the mixtures of the test item with cellulose (4:1 and 1:1) was higher than the buring time of the reference mixture of potassium bromate and cellulose (3:7). Due to the test results the test item does not have to be classified as oxidising solid.
Endpoint:
oxidising liquids
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is a solid
Endpoint:
oxidising gases
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance is a solid

Description of key information

Not an oxidising gas, liquid or solid.

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

Oxidising solids (reference 4.15-1)

A study was performed according to UN Test Methods O.1 in order to determine the oxidising properties of the solid test item. The test item was sieved and dried at 50 °C under vacuum until constant weight. The combustible substance - cellulose, was dried at 105 °C until constant weight. As a reference substance potassium bromate was used. The test item was mixed with cellulose in 4:1 and 1:1 ratios. The mixtures were formed into a truncated conical pile, with a base diameter of 70 mm, covering the looped ignition wire resting on the reaction plate. Power was applied to the ignition wire and was maintained for the duration of the test or for 3 min if the mixture did not ignite and burn during this time. The burning time was recorded from when the power was switched on until the main reaction ended. The test item-cellulose mixture did not ignite in both 4:1 and 1:1 ratios within 3 min. Therefore, the test item was not considered to be classified as oxidising solid according to Division 5.1 of UN Transport Regulation, GHS and Regulation (EU) No. 1272/2008, Annex1: 2.14.

Oxidising liquids (reference 4.15-2)

The test item is a solid at ambient conditions. This hazard class is only applicable for liquids. Thus, the substance was not considered for classification as oxidising liquid.

Oxidising gases (reference 4.15-3)

The test item is a solid at ambient conditions. This hazard class is only applicable for gases. Thus, the substance was not considered for classification as oxidising gas.

Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No. 1272/2008

Based on the chemical structure and taking into account the provisions laid down in Regulation (EC) No. 1272/2008, as amended for the tenth time in Regulation (EC) No. 2017/776, the substance is not considered to be classified for oxidising properties.