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EC number: 230-949-8 | CAS number: 7381-01-3
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:
- 16 July 2013 - 23 August 2013
- 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:
- (2008)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- (1995)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- (1998)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- thermal analysis
- Remarks:
- (differential scanning calorimetry)
- Melting / freezing pt.:
- 36 °C
- Decomposition:
- no
- Sublimation:
- no
- Remarks on result:
- other: Melt. pt.: 309 K
- Conclusions:
- The melting temperature of the substance has been determined to be 36°C using differential scanning calorimetry (GLP-compliant study in accordance with EC A.1, OECD 102 and EPA OPPTS 830.7200).
Reference
PRELIMINARY TEST WITH TGA
From 300°C upwards the weight of the sample decreased significantly. At 364°C, the sample weight had decreased by 25%. After the experiment, a black residue was observed on the lid of the sample container and a black molten residue remained in the sample container.
DSC EXPERIMENTS
Experiment 1: From the endothermic peak directly from the start of the experiment the extrapolated onset temperature could not be determined. The second (broad) endothermic, between 50°C and 150°C, was most likely due to evaporation of volatile components/impurities. The third endothermic , between 175°C and 250°C, has its maximum at 223.30°C. From 275°C, an exothermic effect followed by an endothermic effect was observed. After the experiment, a white/brown residue was observed on the lid of the sample container and a brown molten residue remained in the sample container.
Experiment 2 (with a lower start temperature than Exp. 1): The endothermic peak between 25°C and 50°C had an extrapolated onset temperature of 35.60°C. The endothermic peak between 175°C and 250°C had a peak maximum of 221.60°C. After the experiment, a brown residue was observed on the lid of the sample container and a brown molten residue remained in the sample container.
Experiment 3 (with a lower heating rate than in Exp. 1 and 2): The endothermic peak between 25°C and 50°C had an extrapolated onset temperature of 34.52°C. The endothermic peak between 175°C and 250°C had a peak maximum of 219.34°C. Since both endothermic peaks did not shift to lower temperatures, no conclusions could be given about the effects. After the experiment, a dark brown residue was observed on the lid of the sample container and a dark brown molten residue remained in the sample container.
Experiments 4, 5 and 6 (stopped after each endothermic effect): The endothermic peak between 25°C and 50°C had an extrapolated onset temperature of 35.82°C (Experiment 4), 35.96°C (Experiment 5) and 35.77°C (Experiment 6). The endothermic peak between 175°C and 250°C had a peak maximum of 222.92°C (Experiment 6).After Experiments 4 and 5 the test substance remained visually unchanged (i.e. no difference in colour or consistency were observed). After Experiment 6 a white molten residue remained in the sample container.
Experiment 7 (with a repeated heating cycle). With the first heating peak between 25°C and 50°C had an extrapolated onset temperature of 35.54°C. During cooling an exothermic peak was observed between 0°C and 25°C (crystallization of the test substance). With the second heating an extrapolated onset temperature of 35.21°C was obtained. The results demonstrated that the endothermic effect between 25°C and 50°C was due to melting of the test substance.After the experiment, a white molten residue remained in the sample container.
TGA/DSC curves: see attached document.
ADDITIONAL EXPERIMENT
After storage for 67 hours at 50.0°C it was observed that the test substance was softened. This indicates that melting of the test substance had occurred leading to a very viscous melt.
Description of key information
The melting temperature of the substance has been determined to be 36°C using differential scanning calorimetry (GLP-compliant study in accordance with EC A.1, OECD 102 and EPA OPPTS 830.7200).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 36 °C
Additional information
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