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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
September 21-24, 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study
Qualifier:
according to
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
GLP compliance:
yes (incl. certificate)
Relative self-ignition temperature:
> 400 °C
Remarks on result:
other: no self-ignition temperature up to the melting of the test item or the maximum temperature of 400 °C, respectively.

The test item contains a residual moisture of 0.7 wt.-% which was determined by drying the test item under reduced pressure (approximately 100 mbar) at a temperature of 50 °C.

The pure product indicated a weak exothermal process at 150 °C followed directly by an endothermic process (e.g. melting). In the measurement up to about 400 °C the substance flowed out of the basket. For the pure substance no self-ignition was detected. The product in mixture with Kieselguhr indicates a self ignition starting at 140 °C.

In the investigation of self-ignition in the Grewer-oven for the pure test item a weak exothermal process was detected at a temperature of 150 °C directly followed by an endothermic process at app. 280 °C. The temperature increase during the exothermal process was negligible. The endothermic process can be attributed to the melting of the test item (melting point of the test item 190 °C). After the measurement the basket of the pure test item is empty. The complete test item flowed out of the basket. This indicates that the test item liquefied over the measurement up to 400 °C and flowed out of the wire basket before the self-heating took place.

For the test item in mixture with Kieselguhr an exothermal process was determined at a temperature of 140 °C leading to a maximum temperature of app. 240 °C. A second exothermal effect was observed at 210 °C leading to a maximum temperature of > 500 °C.

Table 1compiles the results of the Gewer-Oven experiment.

Experiment

Onset Self
ignition / °C

Maximum temperature / °C

 

Pure test item

--

--

Test item in mixture
with Kieselguhr (1:1)

140
210

App. 240
> 500

Conclusions:
EC 440/2008, Part A, A.16: The test item has no self-ignition temperature according to EC 440/2008, Part A, A.16. up to the melting of the test item or the maximum temperature of 400 °C, respectively.

Description of key information

The test item has no self-ignition temperature according to EC 440/2008, Part A, A.16. up to the melting of the test item or the maximum temperature of 400 °C, respectively.

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
400 °C

Additional information

The test item has not to be classified as self-heating substance in Class 4 Division 4.2 according to the UN-Transport Regulations.

The test item has not to be assigned as a self-heating substances according to EC 1272/2008 (CLP-Guideline) Annex 1: 2.11.