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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2020-10-01 to 2020-10-27
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: VDI 2263 Sheet 1 Grewer Oven
Version / remarks:
1990
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Key result
Relative self-ignition temperature:
ca. 230 °C

ln the investigation of self-ignition in the Grewer Oven for the pure test item first a small endothermic effect could be observed at a temperature of 40 °C and a second endothermic effect at approx. 220 °C which results into an exothermic effect starting at approx. 230 °C. This effect leads to a temperature increase up to 260 °C (corresponding temperature of the reference material 244 °C). A black residue remained in the wire basket after the test.


For the test item in mixture with Kieselguhr a weak endothermic effect could be observed starting at a temperature of approx. 40 °C and an exothermic effect starting at a temperature of approx. 220 °C which led to a temperature increase up to 650 °C (corresponding temperature of the reference material 238 °C). A grey residue remained in the wire basket after the test.


The table below summarizes the results of the Grewer Oven experiment.





















Experiment



Onset self-
ignition / °C



Maximum temperature / °C



Pure test item



approx. 230



260



Test item in mixture
with Kieselguhr (1:1)



approx. 220



650



 


The pure test item indicated a self-ignition at atmospheric pressure starting at a temperature of approx. 230 °C.

Conclusions:
The test item indicated self-ignition at atmospheric pressure starting at a temperature of approx. 230 °C.
Executive summary:

A study was conducted to determine the self-ignition of the test item according to VDI 2263 Sheet 1 Grewer Oven (1990). First a small endothermic effect could be observed at a temperature of 40 °C and a second endothermic effect at approx. 220 °C which results into an exothermic effect starting at approx. 230 °C.

Description of key information

The test item indicated self-ignition at atmospheric pressure starting at a temperature of approx. 230 °C (reference 4.12-1).

Key value for chemical safety assessment

Autoflammability / Self-ignition temperature at 101 325 Pa:
230 °C

Additional information

A study was conducted to determine the self-ignition of the test item according to VDI 2263 Sheet 1 Grewer Oven (1990). First a small endothermic effect could be observed at a temperature of 40 °C and a second endothermic effect at approx. 220 °C which results into an exothermic effect starting at approx. 230 °C.