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EC number: 603-290-2
CAS number: 128625-52-5
The reaction enthalpy of the test item determined by DSC is greater than 800 J/g (start of the exothermic decomposition: about 130 °C).
Ratios of sample : diatomaceous earth [by mass]
Burning time t [s]
Mean burning times [s]
Flameless carbonization, intensive formation of smoke, sharp and penetrative smell
Decomposition of the sample, intensive formation of smoke with penetrative smell.
*Based on the clear result further testing was not necessary.
Ratios of sample : cellulose [by mass]
Because the burning time of the 4:1 (by mass) ratio of the test item to diatomaceous earth was the same as for the 4:1 (by mass) ratio of test item to cellulose; 16 s with diatomaceous earth and 18 s with cellulose; the result of the UN-Test O.1 is evaluated as false-positive.
A study was conducted according to UN-Test O.1 to determine the oxidising properties of the test item. Additionally, the test item was characterised by dynamic scanning calorimetry. The reaction enthalpy of the decomposition was determined to be greater than 800 J/g. The burning time for the 4:1 ratio of the sample to an inert substance (diatomaceous earth) was similar as for the 4:1 ratio of the sample to cellulose. The burning times were 16 s and 18 s, respectively. Therefore, it is concluded that the measured burning time is based on decomposition and not on oxidising properties. Consequently, the UN-Test O.1 is evaluated as false-positive.
The results of the reference mixtures
of potassium bromate and cellulose are shown below:
Burning times of the reference
mixtures 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
The tests with the mixtures potassium
bromate:cellulose 2:3 was not performed, because the burning time of the
mixtures of the test item with cellulose was lower than the burning time
of the reference mixtures 3:2.
The results of the mixtures of test
item and cellulose are shown below:
Burning times of the mixtures of the test item and cellulose
Test item – Cellulose
Test 5 / s
Due to the tests the test item has to
be classified as oxidizing solid.
A test according to UN O.1 was performed to determine the oxidising properties of the test substance. The test item was sieved. The fraction with particles < 500 µm was used for the tests. 30.0 g ± 0.1 g mixture of the reference item and Cellulose were prepared in the potassium bromate to Cellulose ratio of 3:7, by weight. 30.0 g ± 0.1 g mixture of the test item and Cellulose were prepared in the test item to Cellulose ratio of 4:1 and 1:1, by weight. The average burning time of the reference mixtures of potassium bromate and cellulose (3:2) was 20s and the average burning time of the test item and cellulose (4:1) was 15 s. The burning time of the mixtures of the test item with cellulose (4:1) was lower than the burning time of the reference mixture of potassium bromate and cellulose (3:2). Thus, the test item shows oxidising properties under the test conditions described.
The test item has not to be classified as oxidising solid, oxidising liquid or oxidising gas (reference 4.15-2-4).
Oxidising solids (reference 4.15-4)
In an older study according to UN-Test O.1 (reference 4.15-1) a smiliar average burning time of the test item and cellulose (4:1) was measured with 15 s. However, no test on false-positivity was performed. Therefore, it is not possible to differentiate between decompositon and oxidising effect and the study is disregarded.
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.
Classification, Labelling, and Packaging Regulation (EC) No 1272/2008
Based on available data on oxidising properties, the test item has not to be classified as oxidising solid, according to Regulation (EC) No 1272/2008 (CLP), as amended for the fifteenth time in Regulation (EU) 2020/1182.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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