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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-06-08
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: UN Recommendation on the TRANSPORT OF DANGEROUS GOODS: Manual of Tests and Criteria, Rev. 6 (2015) and UN-Model_Regulations, Rev. 19 (2015), \/Dl 2263 Sheet 1, Grewer-Oven (1990)
Version / remarks:
2015
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Key result
Relative self-ignition temperature:
> 230 °C
Remarks on result:
no self-ignition observed up to the melting point
Relative self-ignition temperature:
ca. 260 °C
Remarks on result:
other: Test item in mixture with kieselguhr (1:1)

In the investigation of self-ignition in the Grewer-Oven an endothermic process was observed for the pure test item and the test item in mixture with kieselguhr in the temperature range of 230 - 250°C. This effect is attributed to the melting of the test item. Hence the pure test item flowed out of the wire basket before self-ignition could occur. The test item mixed with kieselguhr showed a weak self-heating beginning at a temperature of 260°C. This self-heating led to a final temperature of approx. 300°C.

Table 1: Results of the screening test for self-ignition in the Grewer-Oven

Experiment

Onset self ignition / °C

Maximum temperature / °C

Pure test item

----

----

Test item in mixture with kieselguhr (1:1)

260

300

Conclusions:
In the Grewer-Oven test, the pure test item melted at around 230°C and flowed out of the wire basket before self-ignition could occur. Due to the melting of the test item before self-ignition could occur the test item does not need to be classified as self-heating substance in Class 4 Division 4.2 according to the UN Transport Regulation or according to EC 1272/2008 (CLP Regulation) Annex 1: 2.11.

Description of key information

not self-ignitable up to melting point

Key value for chemical safety assessment

Additional information

not self-ignitable up to melting point

GLP study according to VDI 2263, sheet 1 and with respect to the classification procedure of the UN Transport Regulation (Class 4, Division 4.2) and GHS or EC 1272/2008 (CLP Regulation) Annex 1: 2.11) in a Grewer Oven.

UN Transport Regulation: Due to the melting of n-Butyltriphenylphosphonium bromide before self-ignition could occur the test item does not need to be classified as self-heating substance in Class 4 Division 4.2 according to the UN Transport Regulation.

GHS and EC 1272/2008 (CLP Regulation) Annex 1: 2.11: Due to the melting of n-Butyltriphenylphosphonium bromide before self-ignition could occur the test item does not need to be classified as self-heating substance according to EC 1272/2008 (CLP Regulation) Annex 1: 2.11.