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EC number: 277-551-0 | CAS number: 73609-36-6
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:
- weight of evidence
- Study period:
- 2015-07-25 to 2015-07-26
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- The study was conducted in accordance with a relevant test method and in compliance with a known quality system (ISO 9001:2008)
- 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
- Other quality assurance:
- other: ISO 9001:2008
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 2.5 °C
- Atm. press.:
- 1 013 hPa
- Conclusions:
- A melting point value of 2.5°C at 1013 hPa was determined for the substance in accordance with a relevant test method and in compliance with a known quality system. The result is considered to be reliable.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 2015-07-20
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Remarks:
- The study was conducted in accordance with a relevant test method and in compliance with a known quality system (ISO 9001:2008)
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 3015
- Deviations:
- no
- GLP compliance:
- no
- Other quality assurance:
- other: ISO 9001:2008
- Type of method:
- other: Cloud point
- Key result
- Melting / freezing pt.:
- 2 °C
- Atm. press.:
- 1 013 hPa
- Conclusions:
- A melting point value of 2.0°C at 1013 hPa was determined for the substance in accordance with a relevant test method and in compliance with a known quality system. The result is considered to be reliable.
Referenceopen allclose all
The DSC diagrams (attached) show an exothermic peak during the cooling step with an onset temperature at –12.6°C (test1) and –14.0°C (test 2). During the heating step an endothermic peak was detected with an onset temperature at +2.9°C (test1) and +2.1°C (test 2).
Because there is no coincidence between the peaks of cooling and heating step an undercooled melt which begins to crystallize with delay is to be supposed during the cooling step.
The result obtained was thus confirmed using a cloud point study in accordance with ISO 3015 (See WoE Melting point/freezing point 4.2.746 Haas 2015).
Table 1: DSC result
Test |
Melting/Freezing temperature |
1 |
+2.1°C |
2 |
+2.9°C |
Mean value |
+2.5°C, 275.7K |
Approximate accuracy of the instrument: ± 0.5 K (up to 600K)
Table 1: Cloud point result
Time [min] |
Sample Temperature [°C] |
Observations |
0 (start) |
26 |
clear liquid |
5 |
20 |
clear liquid |
10 |
15 |
clear liquid |
15 |
10 |
clear liquid |
20 |
5 |
clear liquid |
23 |
2 |
crystallization on the bottom |
25 |
1 |
crystallization on the bottom |
30 |
3 |
crystallization on the bottom and wall |
40 |
3 |
nearly complete crystallization |
55 |
2 |
complete crystallization |
Result |
+2°C, 275.2 K |
|
Description of key information
Melting point: 2-2.5°C at 1013 hPa
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 2 °C
Additional information
Two reliable measured melting point studies from the same author (Haas 2015) are available for the registered substance. A melting point value of 2.5°C at 1013 hPa was determined for the substance using a Differential Scanning Calorimetry (DSC) in accordance with EU Test Method A.1. Also, a melting point of 2°C at 1013 hPa was determined for the substance using a cloud point in accordance with the ISO 3015 test method. Both studies were conducted in compliance with a known quality system (ISO 9001:2008) and are considered to be reliable. The results are thus used as weight of evidence.
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