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EC number: 276-333-2 | CAS number: 72089-08-8
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:
- 19 April to 20 June 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same 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): Freezing Point
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- -67 °C
- Atm. press.:
- 1 013 hPa
- Conclusions:
- A melting point of -67 °C (at 1013 hPa) was determined for the test substance according to EU Method A.1
Reference
Results
In the temperature range of -70 to -40 °C, a very small endothermic effect (melting) was observed.
Results of the DSC-measurements
No. |
Sample weight / mg |
Onset of Effect / °C |
Range of effect / °C |
Weight loss / mg |
Atmospheric pressure / hPa |
PN10902 |
19.26 |
-66.63 |
-70 to -40 (endo) |
19.26 |
1013.1 |
PN10903 |
19.21 |
-67.29 |
-70 to -50 (endo) |
19.21 |
1013.4 |
During the cooling phase, no thermal effects were observed, which can be assigned to the freezing of the test item.
During the heating phase a very small endothermic effect was observed in the temperature range of -70 to -40 °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 -66.96 °C, the test item has a melting point of -67 °C.
Due to the low energy of the melting peak, the melting of the test item was verified. 3.5 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -80 °C. At this temperature the test item was solid. The appearance of the test item during warming up: between -65 to -50 °C very viscous, at -40 °C liquid. Therefore the melting point in the DSC-measurement was confirmed.
Final Results
The test item has a melting point of -67 °C at atmospheric pressure (1013 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: -67 °C at 1013 hPa (EU Method A.1, differential scanning calorimetry)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -67 °C
Additional information
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