Registration Dossier
Registration Dossier
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EC number: 208-634-1 | CAS number: 536-45-8
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 23 May 2017 to 27 June 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 27 July 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 30 May 2008
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Ministerium für Arbeit, Integration und Soziales des Landes Nordrhein-Westfalen, Düsseldorf, Germany
- Type of method:
- differential scanning calorimetry
- Melting / freezing pt.:
- > 220 °C
- Conclusions:
- Melting point is > 220 ºC (OECD 102, DSC method).
Reference
Results
To determine the melting behavior, the test item was measured by DSC with a heating / cooling rate of ±10 K/min in 2 cycles:
1st heating run: 5 °C to 220 °C
1st cooling run: 220 °C to 30 °C
2nd heating run: 30 °C to 250 °C
For the measurement a capsulated crucible, typical for melting point measurements, was used.
The test item Sodium Anisate shows no melting of crystalline subcomponents in the 1st and 2nd heating run between 5 °C and 220 °C (at ambient temperature the sample is solid). The cooling run shows no crystallization.
The 1st heating run shows an endothermic effect with a beginning at ca. 154 °C. In the 2nd heating run no thermal effects can be observed. Because the endothermic effect is not reversible, it cannot be identified as a melting of crystalline subcomponents of the test item.
Start of the non-reversible endothermic effect from two independent single measurements:
156 °C (from first measurement)
151 °C (from second measurement)
The start of the endothermic effect is defined by using the on-set temperature.
An additional measurement (single determination; 1st heating run; flushing gas: air; open crucible) with a starting temperature at 20 °C shows an exothermic effect at ca. 390 °C (possibly decomposition).
By using the Kofler-heating bank for a subsequent test the endothermic effect occurring in the 1st heating run of the DSC-measurements cannot be identified as a melting of crystalline subcomponents. Between ambient temperature and 260 °C the test item shows no signs of change (especially melting) over the whole measuring time (about 30 minutes) on the Kofler-heating bank.
Description of key information
Melting point is > 220 ºC (OECD 102, DSC method).
Key value for chemical safety assessment
Additional information
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