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Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
Test procedure according to UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
other: UN Manual of Tests and Criteria, Part III, N.4
Key result
Relative self-ignition temperature:
> 140 °C

The test item temperature reached the oven temperature (140°C) after approximately 4 hours. After 24 hours the test was stopped without detecting a significant exothermal effect. The maximum sample temperature was 148 °C.

Conclusions:
neither spontaneous ignition nor self-heating was observed. Therefore, the substance has not to be classified as self-heating according to Regulation (EC) No 1272/2008, annex I, 2.11.
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Remarks:
VDI 2263, part 1
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
other: Directive VDI 2263, Part 1
Relative self-ignition temperature:
>= 205 °C

In the screening test according to Grewer at 205°C the beginning of self-heating was recorded which led to a maximum temperature of about 510°C.

Conclusions:
Due to the results from the Grewer-Oven screening test further studies are necessary to exclude or classify the substance as self-heating substance according to Regulation (EC) No 1272/2008.

Description of key information

Key value for chemical safety assessment

Additional information

The self-heating in air was studied in a screening test according to Grewer (Grewer-Oven-Test, VDI 2263-1)

In this test an exothermal effect was recorded starting at 205 that led to a maximum temperature of about 510°C.

Due to these results from the Grewer-Oven Test an UN N.4 test according to the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, was performed in order to exclude or classify the substance as self-heating substance according to Regulation (EC) No 1272/2008.

In this higher tier study 1000 mL of the test item was stored isothermally at 140°C in a drying oven for 24 hours.

After approximately 4 hours the test item reached the oven temperature of 140°C. Neither spontaneous ignition nor self-heating exceeding the oven temperature of 140°C was observed within 24 hours.

Therefore, the substance has not to be classified as self-heating according to Regulation (EC) No 1272/2008.