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EC number: 273-605-2 | CAS number: 68990-51-2
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:
- September 15, 2017
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study without detailed documentation
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 30 May 2008
- Deviations:
- not specified
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 27 July 1995
- Deviations:
- not specified
- GLP compliance:
- no
- Other quality assurance:
- other: In house quality check
- Type of method:
- differential scanning calorimetry
- Specific details on test material used for the study:
- Batch: XP3647
- Key result
- Melting / freezing pt.:
- >= -23 - <= 59 °C
- Atm. press.:
- >= 1 atm
- Conclusions:
- The melting temperature of the test item has been determined to be over the range -23 to 59 ˚C (250 to 332 K).
- Executive summary:
The test result was based on the range over which the test item melted. This was because freezing temperatures, although consistent in this case, are susceptible to being lower than the melting temperature due to super cooling. Additionally, it was not possible to accurately determine where the freezing event ended. The melting temperature gives an overall more accurate result but the freezing temperature is included for additional information. The melting temperature of the test item has been determined to be over the range -23 to 59 ˚C (250 to 332 K).
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2017
- 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:
- 440/2008
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Remarks:
- differential scanning calorimetry was also applied in the second test
- Key result
- Melting / freezing pt.:
- > 40 - < 80 °C
- Conclusions:
- Melting point has been predicted to be between 40-80 C according to differential scanning calorimetry and capillary methods. It is estimated that 50 C is representative of the melting point. Due to the complex polymeric structure of the substance a clear melting point is not always expected to be observed and the accuracy of the mesured values is not known.
Referenceopen allclose all
Table 1.2
Thermal Event |
Interpretation |
Temperature (˚C) |
|
Determination 1 |
Determination 2 |
||
Broad exotherm |
Onset of freezing |
09,76 |
09,32 |
Peak of freezing |
-17,37 |
-17,87 |
|
Broad endotherm |
Melting range |
-22,56 to 58,53 |
-22,28 to 58,34 |
Description of key information
Two seperate studies are performed to study the melting point of this substance. The first study was an internal study performed using the differential scanning calorimetry, using a procedure designed to be compatible with Method A1 Melting/Freezing Temperature of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 102 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The melting temperature of the test item has been determined to be over the range -23 to 59 ˚C (250 to 332 K).
The second study has been performed by an outside laboratory as a GLP study. Two different methods namely capillary method and differential scanning calorimetry methods have been used. Melting point has been predicted to be between 40-80 °C according to differential scanning calorimetry and capillary methods. It is estimated that 50 °C is representative of the melting point. Due to the complex polymeric structure of the substance a clear melting point is not always expected to be observed and the accuracy of the mesured values is not known.
In conclusion we report a melting point for safety assessment as 50 °C, which we estimate to be representative of the test item. Howewer above information should be kept in mind.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 50 °C
Additional information
The residue of the test item remaining in the crucibles was a white/pale yellow semi-solid.
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