Registration Dossier

Administrative data

Link to relevant study record(s)

Description of key information

An expert assessment has been performed.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

In order to assess if the substance Reactive Yellow 039 possesses the potential to rapidly release huge amounts of energy a thermal analysis (Differential Scanning Calorimetry) has been performed at the Analytical Department Huntsman Textile Effects (Germany) GmbH. The curve displays one peak between 300 and 350 °C representing substance decomposition. As a result, the overall energy release is below a critical trigger level of 500 J/g and the onset of energy release is below 500 °C.

In summary, analysis of the chemical structure reveals an azo-group an alert for explosive properties. The calculated chemical oxygen balance is above the trigger value of -200, but the determination of the exothermic decomposition energy demonstrated an energy release far below the critical value of 500 J/g. Therefore the substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008 and no further testing is required.

Justification for classification or non-classification

In accordance with Column 2 of section 7.11 of REACH Annex VII, the full study has not been conducted as there are no chemical groups associated with explosive properties present in the substance.