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Physical & Chemical properties

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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-05-02
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
no guideline followed
Principles of method if other than guideline:
Self-ignition properties of the test item were deduced from data of the Grewer oven test.
GLP compliance:
no
Key result
Remarks on result:
no self ignition observed under the test conditions

The temperature of the solid test item and the temperature of the reference substance (graphite) do not differ until approx. 220 °C. At this point a slightly endothermic was observed followed by an exothermic behavior of the test item at approx. 240 °C (maximum temperature difference of reference and test item Tmax = 19 °C). The exothermic event was finished at approx. 260 °C. Additional heating until 374 °C did not lead to a difference in the temperature profile of the test item and the reference substance.

No self-ignition test was performed with the test item. However, according to different references (ESCIS Heft 1. 4. Auflage 1998; Grewer T., Zur Selbstentzündung von abgelagertem Staub, Staub-Reinhaltung Luft 31(3), p. 97 - 101, 1971), self-ignition of a solid can be excluded, if in the course of the Grewer oven test there is no temperature excursion of the sample of more than 400 °C (in relation to the reference sample). Based on data from the Grewer oven test the maximum observed temperature of the test item was 374 °C (no difference to the reference sample), which is quite below 400 °C. Therefore, the test item does not have any self-ignition properties.

Conclusions:
The test item does not have any self-ignition properties.
Executive summary:

In the Grever oven test, the temperature of the solid test item and the temperature of the reference substance (graphite) do not differ until approx. 220 °C. At this point a slightly endothermic was observed followed by an exothermic behavior of the test item at approx. 240 °C (maximum temperature difference of reference and test item Tmax = 19 °C). The exothermic event was finished at approx. 260 °C. Additional heating until 374 °C did not lead to a difference in the temperature profile of the test item and the reference substance.

No self-ignition test was performed with the test item. However, according to different references, self-ignition of a solid can be excluded, if in the course of the Grewer oven test there is no temperature excursion of the sample of more than 400 °C (in relation to the reference sample). Based on data from the Grewer oven test the maximum observed temperature of the test item was 374 °C (no difference to the reference sample), which is quite below 400 °C. Therefore, the test item does not have any self-ignition properties.

Description of key information

Based on results from the Grewer oven test, the test item does not have any self-ignition properties.

Key value for chemical safety assessment

Additional information