Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
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:
- 2018-08-23 to 2018-09-12
- 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:
- July 27, 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- March 04, 2016
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- March 1998
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- < -83.5 °C
- Atm. press.:
- 1 013 hPa
- Decomposition:
- no
- Conclusions:
- Melting point / Freezing point (OECD 102): <-83.5 °C (1013 hPa)
- Executive summary:
In a reliable study performed according to relevant guidelines (e.g. OECD 102) and compliant with GLP, the melting point / freezing point of the submission substance was determined. From differential scanning calorimetry (DSC) no freezing point could be determined down to a temperature of -90 °C. Therefore, additional experiments were performed by placing two subsamples of the test item for 20 hours at -21.4 ± 1.7°C and at -83.5 ± 1.6°C respectively. It was observed after storage that the test item was a liquid (-21.4 ± 1.7°C) and a very viscous liquid (-83.5 ± 1.6°C). According to this it was concluded that the melting temperature of the test item is < -83.5°C (< 189.7K).
Reference
Preliminary test (termogravimetric analyzer, TGA):
Starting at 125°C, the weight of the sample decreased significantly. At 162°C, the sample weight had decreased by 25%. After the experiment, a black molten residue remained in the sample container (original colour: red). The change of the colour indicated reaction and/or decomposition of the test item.
Main Study (DSC):
During cooling no effects were observed (data not shown). During heating an endothermic effect was observed starting at 100°C (the DSC curve obtained is shown in the attached Figure). The endothermic effect was probably obtained due to reaction and/or decomposition of the test item. After the experiment, the residue remained unchanged.
An additional investigation of the melting temperature of the test item was performed placing two subsamples of the test item for 20 hours at -21.4 ± 1.7°C and at -83.5 ± 1.6°C respectively. It was observed after storage that the test item was a liquid (-21.4 ± 1.7°C) and a very viscous liquid (-83.5 ± 1.6°C). According to this it was concluded that the melting temperature of the test item is < -83.5°C (< 189.7K).
Description of key information
Melting point / Freezing point (OECD 102): <-83.5 °C (1013 hPa)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -83.5 °C
Additional information
In a reliable study performed according to relevant guidelines (e.g. OECD 102) and compliant with GLP, the melting point / freezing point of the submission substance was determined. From differential scanning calorimetry (DSC) no freezing point could be determined down to a temperature of -90 °C. Therefore, additional experiments were performed by placing two subsamples of the test item for 20 hours at -21.4 ± 1.7°C and at -83.5 ± 1.6°C respectively. It was observed after storage that the test item was a liquid (-21.4 ± 1.7°C) and a very viscous liquid (-83.5 ± 1.6°C). According to this it was concluded that the melting temperature of the test item is < -83.5°C (< 189.7K).
For the key value, no "lower than" values can be specified. Therefore, -83.5°C is given as the key value for the melting/freezing point.
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