Trisodium bis[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-2-hydroxy-5-nitrobenzenesulphonato(3-)]cobaltate(3-)

Oxidising properties

Description of key information

Not oxidizing

Key value for chemical safety assessment

Oxidising properties:

no

Additional information

The oxidizing property of the substance was evaluated according to the EU Method A.17 (Oxidising Properties (Solids)).

The product is not considered an oxidizing substance.

Justification for classification or non-classification

According to the CLP Regulation 1272/2008, section 2.14, Oxidising solid means a solid substance or mixture which, while in itself is not necessarily combustible, may, generally by yielding oxygen, cause, or contribute to, the combustion of other material.

The testing procedures for oxidising solids are based on the capability of an oxidising solid to enhance the combustion of a combustible material. Therefore, solids that are submitted to classification testing are mixed with a combustible material.

An oxidising solid shall be classified in one of the three categories for this class using test O.1 in Part III, sub section 34.4.1 of the UN RTDG, Manual of Tests and Criteria, in accordance with Table 2.14.1.

Criteria for oxidising solids

Category 1: any substance or mixture which, in the 4:1 or 1:1 sample-to-cellulose ratio (by mass) tested, exhibits a mean burning time less than the mean burning time of a 3:2 mixture, by mass, of potassium bromate and cellulose.

Category 2: any substance or mixture which, in the 4:1 or 1:1 sample-to-cellulose ratio (by mass) tested, exhibits a mean burning time equal to or less than the mean burning time of a 2:3 mixture (by mass) of potassium bromate and the criteria for Category 1 are not met.

Category 3: any substance or mixture which, in the 4:1 or 1:1 sample-to-cellulose ratio (by mass) tested, exhibits a mean burning time equal to are less than the mean burning time of a 3:7 mixture (by mass) of potassium bromate and cellulose and the criteria for Categories 1 and 2 are not met.

In the evaluation of results of the EU method A.17, a substance has oxidising properties when the maximum burning rate of the mixtures tested is his higher than or equal to the maximum burning rate of the reference mixture of cellulose and barium nitrate.

Although the principle of this method is quite similar to that of UN Test O.1, the set-up and the criteria of the test method are somewhat different. Moreover, EU test method A.17 was only designed to indicate whether or not a substance or mixture had oxidising properties, and no differentiation with regard to the degree of oxidising power was made.

In the test, the substance is considered not an oxidising substance, therefore it shall not be classified.