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Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25th November 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Expert Statement
Qualifier:
no guideline followed
Principles of method if other than guideline:
Expert judgment based on 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
Specific details on test material used for the study:
Test Material: FAT 36014 - Disperse Yellow 042
Key result
Parameter:
other: Presence of chemical structures associated with explosive properties
Remarks on result:
other: Presence of a nitro-group representing an alert structure for explosive properties
Key result
Parameter:
other: Oxygen balance
Value:
-175.42
Remarks on result:
other: Higher than the trigger value of -200.
Key result
Parameter:
other: Determination of the exothermic decomposition energy
Remarks on result:
other: One exothermic peak between 250 and 340 °C with an energy release of 834,64 J/g

Screening evaluation

Analysis of the molecular structure of Disperse Yellow 042 revealed, that at least one nitro group is present in the molecule.

Calculated oxygen balance was -175.42 and therefore higher than the trigger value of -200.

Determination of the exothermic decomposition energy

The curve displayed one exothermic peak between 250 and 340 °C with an energy release of 834.64 J/g. The peak is considered to represent substance decomposition energy. As a result the energy release is above a critical trigger level of 500 J/g but the onset of energy release is below 500 °C.

Data availability for related sales products

For two of the related sales products containing approximately 30 % (Teratop Yellow GWL-01) and 28 % (Teratop Yellow NFG) of the crude dye, additional data are available. For these products, the following tests have been conducted by a certified test institute:

-         Combustibility test according to VDI 2263, SAV: 006a

-         Decomposition test (Lütolf dynamic) according to VDI 2263, SAV: 010

-         Spontaneous decomposition (deflagration) according to VDI 2263, SAV: 029

-         Decomposition Gas according to VDI 2263, SAV: 010

-         Decomposition test dynamic (Grewer air) according to VDI 2263, SAV: 008

-         Dust explosibility in a modified Hartmann apparatus according to VDI 2263, SAV: 013

-         Minimum ignition energy (MIE) MIKE 3 according to EN 13821, ASTM E2019-03, SAV: 001

As a result of these tests, the products are considered to be negative for spontaneous decomposition, but the release of flammable gases has been observed for Teratop Yellow GWL-01 (40 L/kg at about 350 °C). Nevertheless, the results have been judged “negative”. The test results on Teratop Yellow NFG were also negative. Minimum ignition temperatures (BAM method) have been observed >500 °C for both products.

Interpretation of results:
GHS criteria not met
Conclusions:
The substance is judged to harvest no explosive properties.
Executive summary:

Analysis of the chemical structure revealed the presence of a nitro-group representing an alert structure 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. Additional data generated for two sales products containing about 30 and 28 % of the pure dye demonstrated to be negative in a test on spontaneous decomposition, but release of flammable gases with a gas quantitiy of 40 L/kg at 350 °C has been observed at least for one product. But for both products, process safety of the dried powder material was guaranteed. As a conclusion, the substance is judged to harvest no explosive properties and the crude dye material as well as related products do not have to be classified.

Description of key information

Analysis of the chemical structure revealed the presence of a nitro-group representing an alert structure 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. Additional data generated for two sales products containing about 30 and 28 % of the pure dye demonstrated to be negative in a test on spontaneous decomposition, but release of flammable gases with a gas quantitiy of 40 L/kg at 350 °C has been observed at least for one product. But for both products, process safety of the dried powder material was guaranteed. As a conclusion, the substance is judged to harvest no explosive properties and the crude dye material as well as related products do not have to be classified.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification

Disperse Yellow 042 is judged to be not explosive, hence it does not warrant classification as per the Regulation (EC) No. 1272/2008.