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Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Test procedure according to UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria
Qualifier:
according to
Guideline:
other: UN Manual of Tests and Criteria, Part III, N.4
Version / remarks:
Rev. 6 (2015)
Key result
Relative self-ignition temperature:
> 140 °C

the weighed mass of the test item was 879.0 g.

The test item temperature reached the oven temperature (141 °C) after approximately 32 hours. After approximately 50 hours the test was stopped without detecting an exothermal effect. The maximum sample temperature was 141 °C.

After the measurement the mesh wire basket contained approximately 5 % (w/w) less test item than at the start. The remaining test item appeared unchanged.

Conclusions:
neither spontaneous ignition nor self-heating exceeding the oven temperature of 140°C 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:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Remarks:
VDI 2263, part 1
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
other: Directive VDI 2263, Part 1
Relative self-ignition temperature:
>= 140 °C
Remarks on result:
other: result refers to the pure test substance
Relative self-ignition temperature:
>= 160 °C
Remarks on result:
other: result refers to the kieselgur mixture (1:1)

In the screening test according to Grewer with the pure product an endothermal effect was observed in the temperature range 40 - 140°C. At 140°C the beginning of self-heating was recorded. A multistage reaction was observed which led to a maximum temperature of more than 450 °C.

In the screening test with the kieselguhr mixture 81:19 self-heatiing was detected starting at 160°C. A multistage reaction was observed which led to a maximum product temperature of more than 500°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) with the pure test substance and additionally with a 1:1 kieselgur mixture.

In this test with the pure product and the kieselgur mixture an exothermal effect was recorded starting at 140°C (160°C) that led to a maximum temperature of more than 450°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 the test item was placed in a cube-form sample container of stainless steel. wire netting (edge length 10 cm, mesh size: 0.053 mm) with their top surface open. The oven temperature was adjusted to the test temperature of 140°C.

After approximately 32 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 50 hours.

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