Sodium 1-(3,4-dihydro-6-methyl-2,4-dioxo-2H-pyran-3-ylidene)ethanolate

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Link to relevant study record(s)

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

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

Guideline:

other: VDI 2263 (1990), sheet 1, Grewer oven

GLP compliance:

yes (incl. QA statement)

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).