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Reference
Endpoint:
relative self-ignition temperature (solids)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14 Sept to 23 Sept 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
other: UN Test N.4 (Recommendation on the Transport of Dangerous Goods: Manual of Tests and Criteria, 6th edition, New York and Geneva, 2015, Appendix 6, Screening procedures, Division 4.2: Substances which may be liable ot spontaneous combustion
Qualifier:
according to
Guideline:
other: VDI 2263 (1990), sheet 1, Grewer oven
GLP compliance:
yes (incl. certificate)
Remarks:
Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany
Key result
Relative self-ignition temperature:
>= 260 °C

Self-ignition in the Grewer oven

In the investigation of self-ignition in the Grewer oven for the pure test item an exothermic process was detected from above 260 °C, which led to a maximum temperature of approx. 280 °C (10 °C above the corresponding temperature of the reference material). No further thermal effects could be observed up to the maximum test temperature of 400 °C. The test item welled out of the basket during the test. This may be caused by a decomposition accompanied by a formation of gaseous decomposition products. This effect was also observed in the DSC measurements (see report on melting point CSL-16-1457.01). This also may be the reason, that the temperature rise is only about 10 °C above the reference temperature.

For the test item in mixture with Kieselguhr an exothermic effect was observed from starting at a temperature of approx. 260 °C, which led to a maximum temperature of approx. 390 °C (120 °C above the corresponding temperature of the reference material). No further thermal effects could be observed up to the maximum test temperature of 400 °C.

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

Experiment

Onset self-ignition / °C

Maximum temperature / °C

Pure test item

Approx. 260

280

Test item in mixture with Kieselguhr (1:1)

Approx. 260

390

 

Final Results / Classification

The pure test item dehydroacetic acid sodium salt indicated a slight self-ignition at atmospheric pressure starting at a temperature of 260 °C. Due to the high onset temperature in the Grewer oven, it can be assumed that the UN test N.4 using the 25 mm cube sample at 140 °C is negative.

On the basis of the results of the tests on the self-ignition in the Grewer oven the test item is classified as non-self-heating substance (neither according to UN Transport regulation nor according to GHS / CLP).

Description of key information

The substance dehydroacetic acid sodium salt is not self-heating (UN N.4, Grewer oven).

Key value for chemical safety assessment

Additional information