Registration Dossier
Registration Dossier
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EC number: 247-161-5 | CAS number: 25646-71-3
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:
- 06 Nov 2017 - 25 Mar 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Melting / freezing pt.:
- 129.8 °C
- Atm. press.:
- 1 013 hPa
- Remarks on result:
- other: Atm. pressure taken as 1013 hPa
Reference
Preliminary Test
Starting at 150 °C, the weight of the sample decreased significantly. At 268 °C, the sample weight had decreased by 25%. After the experiment, a black molten residue remained in the sample container (original colour: off-white). The change of the colour indicated reaction and/or decomposition of the test item.
Main Study
An endothermic peak was observed between 100 °C and 150 °C. The extrapolated onset temperature of the peak was 129.863 °C. The endothermic effect was most likely obtained due to melting of the test item. An endothermic peak was observed starting at 225 °C. The endothermic effect was due to reaction and/or decomposition of the test item.
After the experiment, a brown/black molten residue remained in the sample container.
In order to investigate the melting peak, Experiment 2 was stopped directly after the melting peak. The extrapolated onset temperature was 129.649 °C. After the experiment, a colourless molten residue remained in the sample container. It demonstrated that melting was the reason for the endothermic effect. The melting temperature was determined as the mean melting temperature of Experiment 1 (129.863 °C) and Experiment 2 (129.649 °C).
Conclusion
The melting temperature of the test item was 129.8 °C (402.9K).
Description of key information
Melting point is 129.8 ºC (OECD 102, DSC method).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 129.8 °C
Additional information
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