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EC number: 224-580-1 | CAS number: 4418-26-2
Evaluation of the data
The evaluation of the data was performed by the software STARe. As result, a thermogram was obtained in which the heat flow** of the investigated sample is given as a function of the temperature. By integration of the heat flow peaks, the energy of the process was obtained.
If the onset temperatures do not differ more than 0.5 K from their mean value, the mean is used as melting point. If the deviation is greater than 0.5 K, a boiling range is specified (lowest to highest onset temperature).
Due to the fact that mixtures do not have a consistent melting point, the lowest onset temperature is used as the beginning of the melting range.
If the test item decomposes before reaching its melting point, the temperature at the start of the decomposition has to be specified.
The thermogram of the DSC runs PN11868 and PN11879 show in the temperature range of 280 -310 °C a sharp endothermic effect. The test item welled out of the test cell during the test and turned black.
Table: Results of the DSC-measurements
Sample weight / mg
Onset of effect / °C
Range of effect / °C
Weight loss / mg
290 – 310 (endo)
280 – 310 (endo)
* Not determined
The endothermic effect in the temperature range of 280 – 310 °C cannot be clearly assigned to the melting of the test item, since test item welled out of the test cell during the test and turned black. Due to the fact that there are no further exothermal effects afterwards, it can be assumed that the test item decomposes accompanied with a formation of gaseous decomposition products before reaching its melting point. This evaporation is detected as an endothermic effect in the DSC measurements and may overlay the exothermic decomposition. This behavior was also observed in the test in the Grewer oven (see report CSL-16-1457.03, Auto ignition).
Due to this, the test item has no melting point up to its decomposition starting at a temperature of approx. 280 °C.
** = negative heat flow for endothermic processes, positive heat flow for exothermic processes.
The substance dehydroacetic acid sodium salt does not melt up to the decomposition temperature of 280 °C at atmospheric pressure (OECD 102, EU A.1, DSC)
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