2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, potassium sodium salt (1:?:?), coupled with diazotized 2-[(4-amino-5-methoxy-2-methylphenyl)sulfonyl]ethyl hydrogen sulfate

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising 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 incapable of reacting exothermically with combustible materials

Description of key information

Based on the oxygen balance and on the non-classification of several subunits of the test substance, the test substance is considered to be non-oxidising.

Key value for chemical safety assessment

Oxidising properties:

no

Additional information

The oxidizing properties of FAT 40'812/A were screened based on the UN recommendations on the Transport of Dangerous Goods (Orange Book 3rd edition, 1999) where a set of criteria is compiled to evaluate the need for classification of materials as oxidizing substances. According to the criteria as described in the above mentioned UN document: - the classification procedure using experimental testing need not be applied for organic compounds if the compound does not contain oxygen, fluorine or chlorine and – the classification procedure using experimental testing need not be applied for organic compounds if the compound contains oxygen, fluorine or chlorine and these elements are chemically bonded only to carbon and hydrogen. FAT 40812/A is a mixture of related compounds, which contain oxygen part of which is bonded in hydroxyl and ether groups and therefore pose no risk according to the UN recommendations. However, most of the oxygen is bonded in sulfonic acid groups. Thus, the conditions of the UN recommendations are not fulfilled and the oxygen balance was used as a third criterion to predict oxidizing properties: The oxygen balance of FAT 40812 as calculated for the main compound according to the UN recommendations and taking carbon, hydrogen and oxygen into consideration, was found to be negative. In principle this means, that there is a surplus of carbon atoms for a complete reaction according to the following reaction CxHyOz+ [x+(y/4)-(z/2)]O2 --> xCO2+ (y/2)H2O. Based on the internationally recognized UN recommendation criteria and on the oxygen balance, FAT 40812/A is considered to be non-oxidizing and therefore, is not to be tested experimentally for the classification under division 5.1 as oxidizing substances. Thus, it can be concluded beyond a reasonable doubt that FAT 40812/A is not capable of causing fire or enhancing the risk of fire when in contact with combustible material. These statement was extended with a further evaluation by detailing the molecule in small subunits for which a classification with regard to oxidizing properties already exists. The subunits were: sodium benzenesulfonate, phenyl vinyl sulfone, ethyl phenyl sulfone, and methyl sulfate sodium salt. These substances are not classified to be oxidizing. This confirms the previous conclusion.

Justification for classification or non-classification

As the test substance has no oxidising properties, classification is not needed according to the Directive 67/584/EEC and according to the EU Classification, Labelling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008.