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EC number: 613-782-9 | CAS number: 65355-32-0
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:
- 04.07.-02.10.2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Remarks:
- and capillary method
- Key result
- Melting / freezing pt.:
- >= 47 - <= 249 °C
- Atm. press.:
- 1 013 hPa
- Decomposition:
- no
- Conclusions:
- The melting point of the test substance is in the range 47 -249°C with three endothermal effects.
- Executive summary:
A study was conducted according to OECD TG 102 and Regulation (EC) No 440/2008 method A.1 to determine the melting point of the test item using differential scanning calorimetry and capillary method. The test item and the reference were heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Aluminium crucibles with hole were used as containers for the test item and the reference. The test item showed three endothermal effects. The first was observed with an onset temperature of 46.9 °C in the DSC-measurement (optical observation: none). The second endothermal effect had an onset temperature of 201.9 °C (optical observation: melting). The third showed an onset temperature of 248.6 °C (optical observation: starting discolouration).
Reference
DSC measurement
Two DSC measurements with a heating rate of 10 K/min showed several endothermal effects in the temperature range of 45 - 65 °C, 200 – 215 °C and 230 - 265 °C. The onset temperatures were derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline.
Table 1: Melting point (DSC measurements)
Ident No. |
Test item / mg |
Starting temperature / °C |
Final test temperature / °C |
Temperature range (endothermal) / °C |
Onset (melting) / °C |
Crucible |
Observations after the measurement |
36353 |
15.56 |
25 |
500 |
45-60 200-215 230-260 |
46.94 201.99 248.51 |
Aluminium with a hole |
--- |
36356 |
16.28 |
25 |
420 |
45-65 200-215 235-265 |
46.90 201.83 248.78 |
Aluminium with a hole |
--- |
Capillary tube in a metal block
A measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approximately 5 mm.
Table 2: Results of the capillary method
No. |
Set point / °C |
Heating rate / K/min |
End point / °C |
Remarks |
|
1 |
30 |
10 |
280 |
Approx. 197 °C: Approx. 200 °C: Approx. 261 °C: |
test item started to melt test item completely melted test item discoloured to a darker shade |
Description of key information
The melting point of the test substance is in the range 47 -249°C with three endothermal effects (reference 4.2-1).
Key value for chemical safety assessment
Additional information
A study was conducted according to OECD TG 102 and Regulation (EC) No 440/2008 method A.1 to determine the melting point of the test item using differential scanning calorimetry and capillary method. The test item and the reference were heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Aluminium crucibles with hole were used as containers for the test item and the reference. The test item showed three endothermal effects. The first was observed with an onset temperature of 46.9 °C in the DSC-measurement (optical observation: none). The second endothermal effect had an onset temperature of 201.9 °C (optical observation: melting). The third showed an onset temperature of 248.6 °C (optical observation: starting discolouration). (reference 4.2-1)
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