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

Explosiveness

Description of key information

non explosive

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

A supporting test was performed on the structural analogue Acid Brown 282 (ABr282 - Similar Substance 01), according to GLP and conducted according to internationally accepted testing method A.14. ABr282 is not sensitive with respect to heating, shock and hiction; it was concluded that ABr282 has no explosive properties.

The read across can be considered as representative because Acid Brown 365 (ABr365) shares with ABr282 the same structure except for the fact that ABr365 has a sodium nitrobenzenesulphonate group, instead the sodium nitronaphthalene-sulphonate as ABr282. Furthermore, the ABr282 is a disodium salt, while ABr365 is a trisodium salt. The substances contain the same chemical groups associated with explosive properties and the respective oxygen balances are higher than -200 and comparable (ABr365: -102; ABr282: -131).

Furthermore, ABr365 and ABr282 have a comparable thermal behaviour. The Differential Scanning Calorimetry analyses performed on both the analogous, reported that between 25 - 110/130 °C the imbibition water/solvent release was observed, followed by decomposition of the products: starting from 300 °C in the case of ABr365 and between 297 - 443 °C in the case of ABr282.

Based on the structural assessment and thermal behaviour comparison, it is expected that ABr365 has the same explosiveness potential of the ABr282 and thus, it is expected to have no explosive properties. Furthermore evidences connected to the long experience in handling of the substance confirms that no explosive properties have never been observed and reported up to now in the usual conditions of production, stock, transport and use.

Justification for classification or non-classification

According to the CLP Regulation (EC 1272/2008), 2.1 section, an explosive substance or mixture is a solid or liquid substance or mixture of substances which is in itself capable by chemical reaction of producing gas at such a temperature and pressure and at such a speed as to cause damage to the surroundings. Pyrotechnic substances are included even when they do not evolve gases.

Substances, mixtures and articles of this class are classified as explosive on the basis of the results obtained from the test performed according to the methods described in Part I of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria.

The explosiveness assessment was based on the read across approach; Acid Brown 282 is not sensitive with respect to heating, shock and hiction, therefore even the Acid Brown 365 is expected to be non flammable.

In conclusion, according to the CLP Regulation (EC 1272/2008) Acid Brown 365 is not classified for explosiveness.