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EC number: 300-346-5 | CAS number: 93925-43-0
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:
- 20 October 2011 - 23 February 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 27 July 2995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 31 May 2008
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- < -80 °C
- Atm. press.:
- 1 013.325 hPa
Reference
Preliminary test:
From 300 °C upwards the weight of the sample decreased significantly. At 340 °C the sample weight had decreased by 25%. After the experiment, grey/black residue was observed on the lid of the sample container and a black residue remained in the sample container (original colour: pale yellow). The change of the colour indicated reaction and/or decomposition of the test substance.
Main study:
During heating, a small endothermic effect was observed between -25 °C and 25 °C. The effect was most likely obtained due to melting of water present in the test substance. The extrapolated onset temperature of the peak was -3.28 °C. This conclusion was also based on an exothermic effect (crystallization of water) that was observed during cooling between -30 °C and -60 °C (results are archived in the raw data). After melting of water, a broad endothermic effect was observed between 50 °C and 250 °C followed by reaction and/or decomposition of the test substance (exothermic effect starting at 250 °C). The first effect was possibly due to evaporation of water and/or other volatile impurities of the test substance.
After the experiment, a light yellow residue was observed on the lid of the sample container and in the sample container (original colour: pale yellow). The change of the colour indicated reaction and/or decomposition of the test substance. The second experiment was performed to obtain a duplicate measurement on the effects observed below 250 °C.
Similar results to the first experiment were obtained. The extrapolated onset of the melting peak of water was -4.11 °C. After the experiment, the test substance colour was unchanged, only a small aliquot of substance was evaporated.
To further investigate the melting temperature of the test substance two samples of the compound were stored overnight in the freezers at -20 °C and -80 °C. It was observed after storage that the test substance was still a liquid (white paste) in both freezers. According to this observation, it was concluded that the melting temperature of the test substance is < -80 °C.
Description of key information
The melting point of the test substance is < -80 °C (OECD 102, DSC).
Key value for chemical safety assessment
Additional information
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