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EC number: 937-960-3 | 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:
- 24 Mar 2016 to 20 Jun 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)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Qualifier:
- according to guideline
- Guideline:
- other: CIPAC MT 1 (2009)
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- -88.2 °C
- Atm. press.:
- 1 019 hPa
- Conclusions:
- A melting point value of -88.2 °C (at 1019 hPa) was determined for the test item according to E.U. Method A.1.
Reference
Results
In the thermograms of the DSC runs PN10748 and PN10749 in the temperature range of -90 to -50 °C, an endothermic effect (melting) was observed. A second small and broad endothermic effect in the temperature range of -50 to 0 °C was observed.
During the cooling phase, no thermal effects were observed, which can be assigned to the freezing of the test item.
During the heating phase an endothermic effect was observed in the temperature range of -90 to -50 °C, which can be assigned to the melting of the test item. As the onset temperatures in both tests deviate by less than 0.5 K from their mean value of -88.23 °C, the test item has a melting point of -88.2 °C.
A second small and broad endothermic effect in the temperature range of -50 to 0 °C was observed and showed an untypical peak for melting of the test item. Due to the low energy of the melting peak, the melting of the test item was verified. 2.5 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -90 °C. At this temperature the test item was solid. The appearance of the test item during warming up: between -85 to -75 °C very viscous, at -60 °C liquid. Therefore the melting point in the DSC-measurement was confirmed.
Table 1: Results of the DSC measurements
No.
|
Sample weight (mg) |
Onset of effect (°C) |
Range of effect (°C) |
Weight loss (mg) |
Atmospheric pressure (hPa) |
PN10748 |
13.79 |
-88.22 242.94 |
-90 to -50 (endo) -50 to 0 (endo) 120 to 310 (endo) |
13.74 |
1019 |
PN10749 |
19.00 |
-88.23 247.33 |
-90 to -50 (endo) -50 to 0 (endo) 120 to 300 (endo) |
18.99 |
1019 |
Final Results
The test item has a melting point of -88.2 °C at atmospheric pressure (1019 hPa) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).
Description of key information
Melting point: -88.2 °C at 1019 hPa (EU Method A.1., differential scanning calorimetry)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -88.2 °C
Additional information
A melting point value of -88.2 °C (at 1019 hPa) was determined for the test substance according to E.U. Method A.1.
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