Sodium 3-[[3-methoxy-4-[(4-methoxyphenyl)azo]phenyl]azo]benzenesulphonate

Explosiveness

Link to relevant study record(s)

Reference

Endpoint:

explosive properties of explosives

Type of information:

other: Expert statement

Adequacy of study:

key study

Study period:

Study completion date - 13 July 2015.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Expert statement

Principles of method if other than guideline:

The screening procedure as described in:
- CLP, Annex I, Part 2, paragraphs 2.1.4.2 and 2.1.4.3
- Appendix 6 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria
- Technical Guidance Document on the Information Requirements for REACH, Part 2 EWG 1-7, REACH Implementation Project (RIP) 3.3 Phase 2, chapter 7.1.11.3

GLP compliance:

no

Parameter:

other: More sensitive to shock than m-dinitrobenzene

Remarks on result:

not measured/tested

Parameter:

other: More sensitive to friction than m-dinitrobenzene

Remarks on result:

not measured/tested

Parameter:

other: Explosive under influence of flame

Remarks on result:

not measured/tested

Screening evaluation

Analysis of the above depicted molecular structure revealed, that two aliphatic azo-bonds are present in the molecule representing chemical alert structures for explosive properties. Calculation of the oxygen balance according to the above mentioned formula is -163.76 and therefore higher than the trigger value of -200.

 

Determination of the exothermic decomposition energy:

The curve displays one exothermic peaks up to 350 °C with a total energy release of about 694.97 J/g. This peak is considered to represent substance decomposition. As a result, the overall energy release is above a critical trigger level of 500 J/g and the onset of energy release is below 500 °C.

Interpretation of results:

GHS criteria not met

Conclusions:

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.

Executive summary:

In summary, analysis of the chemical structure reveals two aliphatic azo-bonds in the molecule, representing alert structures for explosive properties. The calculated chemical oxygen balance is above the trigger value of -200 and the determination of the exothermic decomposition energy demonstrated an energy release above the critical value of 500 J/g. Further, tests on thermal stability revealed no risk for detonation or spontaneous deflagration. 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.

Description of key information

In order to assess if the substance Acid Yellow 219 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 results of the measurement show the overall energy release is below a critical trigger level of 500 J/g and the onset of energy release is below 500 °C. However, analysis of the chemical structure reveals no alerts for explosive properties. The calculated chemical oxygen balance is below the trigger value of -200 and the determination of the exothermic decomposition energy demonstrated no energy release up to 350 °C. Therefore, the substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008 and no further testing are required.

Key value for chemical safety assessment

Explosiveness:

non explosive

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.