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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2018-05-23 to 2018-11-13
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
other: VDI 2263, part 1 1990, test methods for the determination of the safety characteristics of dusts; UN Transport Regulations, Appendix 6, Screening Procedures (Substances which may be liable to spontaneous combustion (Division 4.2))
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.16 (Relative Self-Ignition Temperature for Solids)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Key result
Remarks on result:
no self ignition observed under the test conditions

In the investigation of self-ignition in the Grewer Oven for the pure test item a first small endothermic process was detected starting at approx. 60 °C and a second, starting at approx. 200 °C. After the test, only half of the test item volume was present in the wire basket. The residue in the wire basket was black. No self-heating or self-ignition could be observed up to 400 °C.

Conclusions:
No self-heating or self-ignition could be observed up to 400 °C.
Executive summary:

A study was conducted according to VDI 2263, part 1 1990, test methods for the determination of the safety characteristics of dusts; UN Transport Regulations, Appendix 6, Screening Procedures (Substances which may be liable to spontaneous combustion (Division 4.2)) to determine the self-heating properties of the test item. The test item was filled in a small wire basket of a volume of 8 cm3 and this wire-basket was placed into the oven. In this oven, the self-ignition behaviour of five samples can be determined simultaneously. An additional basket was filled with a reference material (graphite). The temperature of the oven was increased with a constant heating rate (1.2 K/min) in an air stream of 100 to 120 L per hour and the temperature of the sample was recorded as a function of time at intervals of 10 seconds. In the investigation of self-ignition in the Grewer Oven for the pure test item a first small endothermic process was detected starting at approx. 60 °C and a second, starting at approx. 200 °C. After the test, only half of the test item volume was present in the wire basket. The residue in the wire basket was black. No self-heating or self-ignition could be observed up to 400 °C. In accordance with REACH Annex VII this test result exclude self-heating of the test item up to 400 °C and thus the test according to EU method A.16 was not conducted.

Description of key information

No self-heating or self-ignition could be observed up to 400 °C and the auto-ignition temperature was determined to be above 400 °C.

Key value for chemical safety assessment

Additional information

A study was conducted according to VDI 2263, part 1 1990, test methods for the determination of the safety characteristics of dusts; UN Transport Regulations, Appendix 6, Screening Procedures (Substances which may be liable to spontaneous combustion (Division 4.2)) to determine the self-heating properties of the test item. The test item was filled in a small wire basket of a volume of 8 cm3 and this wire-basket was placed into the oven. In this oven, the self-ignition behaviour of five samples can be determined simultaneously. An additional basket was filled with a reference material (graphite). The temperature of the oven was increased with a constant heating rate (1.2 K/min) in an air stream of 100 to 120 L per hour and the temperature of the sample was recorded as a function of time at intervals of 10 seconds. In the investigation of self-ignition in the Grewer Oven for the pure test item a first small endothermic process was detected starting at approx. 60 °C and a second, starting at approx. 200 °C. No self-heating or self-ignition could be observed up to 400 °C. In accordance with REACH Annex VII this test result exclude self-heating of the test item up to 400 °C and thus the test according to EU method A.16 was not conducted.