Registration Dossier
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EC number: 610-161-4 | CAS number: 4403-36-5
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:
- 2018-06-26 to 2018-08-02
- 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:
- 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- 1998
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 160.1 °C
- Atm. press.:
- > 1 012 - <= 1 013 hPa
- Decomposition:
- yes
- Decomp. temp.:
- >= 210 °C
- Sublimation:
- no
- Conclusions:
- The test item TA-2 has a melting point of 160.1 °C at atmospheric pressure (1012 – 1013 hPa) as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).
Reference
During the DSC runs the test item shows two endothermic effects in the temperature ranges of 150 °C – 180 °C and 210 °C – 370 °C.
The shape of the second endothermic effect suggests that the test item starts to decompose at approx. 210 °C; in view of the weight loss of the sample the decomposition is accompanied with gas formation and/or boiling of the decomposition products.
In order to investigate if the first endothermic effect observed in the temperature range from 150 °C – 180 °C can be associated with a melting of the test item further measurements were carried with the capillary method.
Capillary Method
For verification of the results the test item was additionally tested three times according to the capillary method. In the three tests, the test item melted at a temperature of 166.0 °C, 165.7 °C and 166.0 °C, respectively (mean value: 165.9 °C). At a temperature of 190 °C, the test item started to climb in the capillary. At a temperature of 210 °C, the test item started to turn dark. At a temperature of 260 °C the test item was black. The measurements carried out with the capillary method showed that the first endothermic effect observed in the DSC measurements in the temperature range of 150 °C – 180 °C can be assigned to a melting of the test item. As the onset temperatures of the first endothermic effect observed in the DSC measurements do not deviate by more than 0.5 K from their mean value of 160.06 °C, the melting temperature is reported as 160.1 °C.
Description of key information
The test item TA-2 has a melting point of 160.1 °C at atmospheric pressure (1012 – 1013 hPa) as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 160.1 °C
Additional information
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