Reaction products of 4-amino-5-hydroxynaphthalene-2,7-disulfonic acid, coupled twice with diazotized 2-[(4-aminophenyl)sulfonyl]ethyl hydrogen sulfate, sodium salts

Explosiveness

Link to relevant study record(s)

Reference

Endpoint:

explosiveness

Type of information:

other: Expert statement

Adequacy of study:

key study

Study period:

2016-02-09

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Expert assessment

Qualifier:

according to guideline

Guideline:

other: - CLP, Annex I, Part 2, paragraphs 2.1.4.2 and 2.1.4.3

Qualifier:

according to guideline

Guideline:

other: Appendix 6 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria

Qualifier:

according to guideline

Guideline:

other: 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

Principles of method if other than guideline:

Screening based on chemical structure analysis in silica and established calculation models

GLP compliance:

no

Parameter:

other: More sensitive to shock than m-dinitrobenzene

Remarks:

migrated information

Remarks on result:

not measured/tested

Parameter:

other: More sensitive to friction than m-dinitrobenzene

Remarks:

migrated information

Remarks on result:

not measured/tested

Parameter:

other: Explosive under influence of flame

Remarks:

migrated information

Remarks on result:

not measured/tested

Parameter:

other: Explosive (not specified)

Remarks:

migrated information

Remarks on result:

negative (not further specified)

Screening evaluation

No experimental test data according to EU Method A.14 or comparable methods for Reactive Black 005 are available.

Considering that explosive properties are associated with the presence of certain chemical groups in the molecule, a screening evaluation can be conducted aimed to identify the presence of such reactive groups within the molecular structure harvesting the capability for a rapid high energy release.

According to CLP Regulation examples of groups which may indicate explosive properties are:

-       C-C unsaturation (e.g. acetylenes, acetylides, 1,2-dienes);

-       C-Metal, N-Metal (e.g. Grignard reagents, organo-lithium compounds);

-       Contiguous nitrogen atoms (e.g. azides, aliphatic azo compounds, diazonium salts, hydrazines, sulphonylhydrazides);

-       Contiguous oxygen atoms (e.g. peroxides, ozonides);

-       N-O (e.g. hydroxyl amines, nitrates, nitro compounds, nitroso compounds, N-oxides, 1,2-oxazoles);

-       N-halogen (e.g. chloramines, fluoroamines);

-       O-halogen (e.g. chlorates, perchlorates, iodosyl compounds).

Analysis of the above depicted molecular structure revealed, that at least two azo groups representing chemical alert structures for explosive properties are present in the molecule.

Calculation of the oxygen balance according to the above mentioned formula is -101.78 and therefore higher than the trigger value of -200 [calculation based on molecular weight of the free acid form].

Determination of the exothermic decomposition energy

In order to assess if the substance Reactive Black 005 possesses the potential to rapidly release huge amounts of energy a thermal analysis (Differential Scanning Calorimetry) has been performed at Aventis Research & Technologies. The results of the measurement are shown in Annex 1.

The curve displays one exothermic peak up to 350 °C with an overall energy release of 443 J/g, which is considered to represent substance decomposition energy. A second test with a different test sample revealed similar data (energy release 435 J/g; onset 170.5 °C). As a result, energy release is below a critical trigger level of 500 J/g and the onset of energy release is below 500 °C.

Interpretation of results:

non explosive

Remarks:

Migrated information

Conclusions:

The substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008.

Executive summary:

In summary, analysis of the chemical structure revealsat least two azo groups being present representing chemical alert structures 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 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.

Description of key information

A test to determine sensitivity to dust explosion was determined in a modified Hartmann Rohr. According to the test results the test substance did not show sensitivity to dust explosion. In addition, the explosive properties of the test substance have been evaluated based on the chemical structure and the physical-chemical properties. In summary, analysis of the chemical structure reveals at least two azo groups being present representing chemical alert structures 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 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.

Key value for chemical safety assessment

Explosiveness:

non explosive

Justification for classification or non-classification

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.