Registration Dossier
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EC number: 825-609-6 | CAS number: 98458-83-4
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:
- from 19 February 2016 to 23 June 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- 1998
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 0 °C
- Atm. press.:
- >= 1 007 - <= 1 011 hPa
- Conclusions:
- The melting temperature of the substance was determined to be 0°C.
- Executive summary:
Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200. The melting temperature of the substance was determined in triplicate obtaining a mean value of 0°C (at 1009 ± 2 hPa).
Reference
DSC EXPERIMENT 1
-Endothermic peak between -50°C and 50°C with extrapolated onset temperature of -0.31°C.
-Endothermic effect between 150°C and 325°C with extrapolated onset temperature of 254.96°C.
-After the experiment it was observed that the test item was evaporated from the sample container.
DSC EXPERIMENT 2
To investigate the peak between -50°C and 50°C a repeated heating cycle (as well as a hermetic sealed sample pan to investigate the effect between 150°C and 325°C) was applied. With the first heating the extrapolated onset temperature was -0.33°C. The similar value indicated that melting of the test item was the reason for the effect. During cooling an exothermic peak was observed between -20°C and -40°C, due to crystallization of the test item.
With the second heating an extrapolated onset temperature of 0.09°C was obtained. The results confirmed that the endothermic effect was due to melting of the test item.
The extrapolated onset temperature of the second effect was 305.02°C. As can be seen the endothermic peak shifted to higher temperatures. It demonstrated that evaporation of the test item was the reason for the endothermic effect.
After the experiment it was observed that the test item was evaporated from the sample container.
DSC EXPERIMENT 3
The temperature program was similar as the program of Experiment 1 and similar results were obtained. Extrapolated onset temperatures: -0.68°C and 254.97°C.
DATA HANDLING
The melting temperature was determined as the mean extrapolated onset temperature of Experiment 1 (-0.31°C), Experiment 2 (-0.33°C) and Experiment 3 (-0.68°C).
Description of key information
The melting temperature of the substance was determined to be 0°C.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 0 °C
Additional information
Determined using Differential Scanning Calorimetry (DSC) in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200.
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