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Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, Sixth Revised Edition, 2015, Appendix 6.
Version / remarks:
2015
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ASTM E537
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Key result
Parameter:
other: Heat of decomposition
Remarks on result:
other: No further testing required, as heat of decomposition <500 J/g

The thermogram was featureless apart from two small exothermic peaks over the temperature range 261 - 380 °C. The total normalised energy output from the exothermic peaks, i.e. the heat of decomposition, was 37 J/g.

Interpretation of results:
GHS criteria not met
Conclusions:
The heat of decomposition determined by DSC was 37 J/g. As this is well below 500 J/g, the substance is considered to be non-explosive.
Executive summary:

The heat of decomposition of the substance was determined by differential scanning calorimetry under GLP in accordance with the standard ASTM E537. This is a suitable technique for measuring the exothermal decomposition energy as required for screening explosive substances. In accordance with Appendix 6 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, a substance can be considered as non-explosive and further testing is not required if the exothermic decomposition energy of a substance is less than 500 J/g. An aliquot of 3.6 mg of the test substance was placed in a high pressure gold-plated stainless steel crucible and heated from 25 to 500 °C at a rate of 5 °C/min. Nitrogen was used as purge gas at a flow rate of 50 to 100 mL/min. The resulting thermogram was featurless apart from two small exothermic peaks over the temperature range 261 - 380 °C. The total normalised energy output from these peaks, i.e. the heat of decomposition, was 37 J/g. This indicates that the substance should be considered as non-explosive.

Description of key information

Heat of decomposition = 37 J/g (DSC screening, ASTM E537, GLP)

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification

The heat of decomposition of the substance was tested under GLP by Differential Scanning Calorimetry in accordance with the standard ASTM E537 and found to be 37 J/g. In accordance with Appendix 6 of the UN Recommendations on Transport of Dangerous Goods, a substance can be considered as non-explosive if the energy of exothermic decomposition of the substance is less than 500 J/g. The substance is therefore considered to be non-explosive and a classification is not warranted.

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