Registration Dossier
Registration Dossier
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EC number: 273-381-6 | CAS number: 68958-92-9
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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- July 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- May 2008 (Commission Regulation (EC) No 440/2008)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Decomposition:
- yes
- Decomp. temp.:
- > 200 °C
- Conclusions:
- No melting point was determined. A glass transition ofthe test itemwas observed at -62.5°C (210.7K). Reaction and/or decomposition of the test item was observed at > 200°C.
Reference
Preliminary Test
The TGA curve ofthe test item is shown in Figure 1 in the attached document "S-930 - Melting and Boiling Temperature.pdf". Starting at 210°C, the weight of the sample decreased significantly. At 230°C, the sample weight had decreased by 25%. At 549°C (end of the experiment), 50% weight loss of the test item was observed. After the experiment, black residue was observed on the lid of the sample container and a black residue remained in the sample container (original colour: dark brown). The change of the colour indicated reaction and/or decomposition of the test item.
Main Study
The DSC curve obtained during cooling in Experiment 1 is shown in Figure 2 (see attached document "S-930 - Melting and Boiling Temperature.pdf"). During cooling a glass transition was observed between -80°C and -50°C. During heating a glass transition was observed between -75°C and -25°C. The inflection point of the glass transition was -62.935°C. An exothermic peak was observed starting at 200°C. After the experiment, a black residue remained in the sample container. The exothermic effect was due to reaction and/or decomposition of the test item.
Experiment 2 was performed to determine the duplicate glass transition temperature. Figure 3 (see attached document "S-930 - Melting and Boiling Temperature.pdf") shows the DSC curve obtained during cooling. The inflection point of the glass transition was -62.055°C. After the experiment, the sample appeared to have been unchanged, i.e. no decomposition was observed.
The glass transition temperature was determined as -62.5°C (mean glass transition temperature of Experiment 1 and 2).
Description of key information
No melting point was determined (OECD 102, EU A.1)
Key value for chemical safety assessment
Additional information
No melting point was determined. A glass transition of the test item was observed at -62.5°C (210.7K). Reaction and/or decomposition of the test item was observed at > 200°C.
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