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Physical & Chemical properties

Flammability

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Administrative data

Endpoint:
self-heating substances / mixtures
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-10-25 - 2018-04-19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
UN Manual of Tests and Criteria: Test N.4 (Test method for self-heating substances)
Version / remarks:
Rev. 6, 2015
Deviations:
no
Qualifier:
according to
Guideline:
other: VDI 2263, sheet 1, Grewer Oven
Version / remarks:
1990
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
Test item: Black DB
Appearance: black powder
Specific details on test material used for the study:
Reagents: Kieselguhr
Batch No.: TA2082010
Identity and content: Conforms
Certificate of analysis: Certificate of Analysis dated 2016-10-20; Merck KGaA, Frankfurter Straße 250, 64293 Darmstadt
Expiry date: 2021-10-31

Results and discussion

Self-heating substances / mixtures
Key result
Test procedure:
other: Onset temperature in the Grewer oven
Max. temp. reached:
600
Result:
positive outcome (effect observed)
Remarks on result:
other:
Remarks:
The test item showed a self-heating starting at a temperature of 130 °C.

Any other information on results incl. tables

Self-ignition in the Grewer Oven

In the investigation of self-ignition in the Grewer Oven for the pure test item, showed a self-heating starting at a temperature of 130 °C that led to a maximum temperature of approx. 600 °C (corresponding oven temperature 265 °C). After the measurement a black residue remained in the basket.

For the test item in mixture with Kieselguhr a self-heating starting at a temperature of 130 °C was observed that led to a maximum temperature of approx. 620 °C (corresponding oven temperature 315 °C).

Table 1 summarizes the results of the Grewer Oven experiment.

Table 1: Results of the screening test for self-ignition in the Grewer Oven

Experiment

Onset self-
ignition / °C

Maximum temperature / °C

Remarks

Pure test item

130

600

Test item in mixture
with Kieselguhr (1:1)

220

620

Applicant's summary and conclusion

Interpretation of results:
study cannot be used for classification
Conclusions:
The pure test item Black DB indicated a self-heating starting at a temperature of 130 °C that led to a maximum temperature of approx. 600 °C (corresponding oven temperature 265 °C).

On the basis of the results of the screening test on the self-ignition in the Grewer Oven a classification of the test item as self-heating substance cannot be excluded. Further tests according to UN Test N.4 (Bowes-Cameron-Cage Test) have to be performed for the classification.
Executive summary:

The pure test item Black DB indicated a self-heating starting at a temperature of 130 °C that led to a maximum temperature of approx. 600 °C (corresponding oven temperature 265 °C).

On the basis of the results of the screening test onthe self-ignition in the Grewer Oven a classification of the test item as self-heating substance cannot be excluded. Further tests according to UN Test N.4 (Bowes-Cameron-Cage Test) have to be performed forthe classification.