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EC number: 947-993-5 | 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:
- 07 March 2018 to 28 March 2018
- 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
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Melting / freezing pt.:
- >= -16.2 - <= 9.1 °C
- Remarks on result:
- other: glass transition observed at -55.0 °C (218.2K)
- Conclusions:
- The melting range of the test item was -16.2 to 9.1 °C (257.0 to 282.3K). A glass transition ofthe test item was observed at -55.0°C (218.2K).
- Executive summary:
GUIDELINE
The investigation was conducted in accordance with OECD Guideline 102 Melting Point/Melting Range (July 27, 1995), EC Guideline A.1 Melting/Freezing Temperature (March 04, 2016) and EPAProduct Properties Test Guideline OPPTS 830.7200: Melting Point/Melting Range (March 1998). The melting temperature of the test item was determined by Differential Scanning Calorimetry (DSC).
RESULTS
The melting range of the test item was -16.2 to 9.1 °C (257.0 to 282.3K). A glass transition ofthe test item was observed at -55.0°C (218.2K).
Reference
PRELIMINARY TEST
- The TGA curve of the test item is shown in Figure 1 (attached).
- Starting at 250°C, the weight of the sample decreased significantly.
- At 309°C, the sample weight had decreased by 25%.
- After the experiment, a colourless residue remained in the sample container (original colour: colourless).
MAIN STUDY
- The DSC curve obtained with Experiment 1 is shown inFigure 2(attached).
- During cooling,an exothermic peak between -25 °C and -10 °C was found (results are archived in the raw data). The effect was obtained due to crystallization of the test item.
- A glass transition was observed between -70 °C and -40 °C. During heating, a glass transition was observed between -75 °C and -50 °C.
- The inflection point of the glass transition was -54.595 °C. Exothermic and endothermic peaks were observed between -50°C and 25 °C directly followed by a broad endothermic effect between 25°C and 100°C.
- The peak maximum of the endothermic peaks were -16.099 °C (first peak), -7.500 °C (second peak) and 9.328 °C (third peak).
- The exothermic effects were due to crystallisation of the test item.
- The endothermic effects were due to melting of the test item.
- The broad endothermic effect was due to evaporation of volatile components, based on the weight loss observed during the preliminary test. An endothermic peak was observed starting at 200°C. This endothermic effect was due to reaction and/or decomposition of the test item.
- Experiment 2 was performed to determine duplicate glass transition temperature and duplicate melting temperatures. Figure 3 (attached) shows the DSC curve obtained. The inflection point of the glass transition was -55.349 °C. The peak maximum of the endothermic peaks were -16.277 °C (first peak), -7.693 °C (second peak) and 8.923 °C (third peak). After the experiment, the sample appeared to have been unchanged, i.e. no decomposition and/or evaporation were observed.
- The glass transition temperature was determined as the mean glass transition temperature of Experiment 1 (-54.595 °C) and Experiment 2 (-55.349 °C).
- The test item is a mixture. Three endothermic melting peaks were observed. Therefore, a melting range was given instead of a melting temperature. The melting range was determined with the melting temperatures obtained with Experiment 1 (-16.099 °C, -7.500 °C and 9.328 °C) and Experiment 2 (-16.277 °C, -7.693 °C and 8.923 °C).
Description of key information
The melting range of the test item was -16.2 to 9.1 °C (257.0 to 282.3K). A glass transition of the test item was observed at -55.0°C (218.2K) (OECD 102. EU Method A.1 and OPPTS 830.7200).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -16.2 °C
Additional information
GUIDELINE
The investigation was conducted in accordance with OECD Guideline 102 Melting Point/Melting Range (July 27, 1995), EC Guideline A.1 Melting/Freezing Temperature (March 04, 2016) and EPAProduct Properties Test Guideline OPPTS 830.7200: Melting Point/Melting Range (March 1998). The melting temperature of the test item was determined by Differential Scanning Calorimetry (DSC).
RESULTS
The melting range of the test item was -16.2 to 9.1 °C (257.0 to 282.3K). A glass transition of the test item was observed at -55.0 °C (218.2K).
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