Chromate(2-), [4-[(5-chloro-2-hydroxy-3-nitrophenyl)azo]-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)][3-[[1-(3-chlorophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]-4-hydroxy-5-nitrobenzenesulfonato(3-)]-, disodium

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: 05 November, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Justification for type of information:

None

Qualifier:

according to guideline

Guideline:

other: Expert statement

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:

Expert statement

GLP compliance:

no

Specific details on test material used for the study:

None

Parameter:

other: Presence of chemical structures associated with explosive properties

Remarks:

analysis of the chemical structure reveals that two azo groups representing chemical alert structures for explosive properties are present in the molecule.

Remarks on result:

other: analysis of the chemical structure reveals that two azo groups representing chemical alert structures for explosive properties are present in the molecule.

Parameter:

other: Oxygen balance

Value:

-112.11

Remarks on result:

other: lower than the trigger value of -200

Parameter:

other: Determination of the exothermic decomposition energy

Remarks on result:

other: The curve displays one exothermic peak between 300 °C and 350 °C with a total energy release of 211.29 J/g. 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.

Screening evaluation:

Analysis of the molecular structure revealed that 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 -128.35 and therefore higher than the trigger value of -200.

Determination of the exothermic decomposition energy

The curve displays one exothermic peak between 300 °C and 350 °C with a total energy release of 211.29 J/g which is considered to represent 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.

Interpretation of results:

GHS criteria not met

Conclusions:

Acid Red 407 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:

No experimental test data according to EU Method A.14 or comparable methods for Acid Red 407 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 chemical structure reveals that two azo groups representing chemical alert structures for explosive properties are present in the molecule. 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.

Description of key information

The explosive properties of Acid Red 407 were estimated based on the UN Recommendations on the Transport of Dangerous Goods (Manual of Tests and Criteria, Annex 6, Orange Book, 3rd edition, 1999). Analysis of the chemical structure reveals that two azo groups representing chemical alert structures for explosive properties are present in the molecule. 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.

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.