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Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009-10-16 to 2010-01-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Guideline-conform study under GLP without deviations.
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
GLP compliance:
yes (incl. QA statement)
Type of method:
thermal analysis
Remarks:
differential scanning calometry
Specific details on test material used for the study:
Identification as reported on study report: cC6O4
Batch Number: 156/17
Purity > 98%
Expiry date: December 31, 2020
Storage conditions: At room temperature at about 20°C
Key result
Melting / freezing pt.:
64.6 °C
Atm. press.:
ca. 1 atm
Decomposition:
no
Sublimation:
no
Remarks on result:
other: The result of 64.6 °C represents the arithmetic mean of two measurements, 64.4 and 64.8 °C, respectively.
Melting / freezing pt.:
337.8 K
Atm. press.:
ca. 1 atm
Decomposition:
no
Sublimation:
no
Remarks on result:
other: The result of 337.8 K represents the arithmetic mean of two measurements, 337.6 and 338 K, respectively.

Preliminary Test

The DSC-curve of the preliminary test (heating rate of 20 °C/min from 25 °C to 400 °C) is

shown in Figure 1. An endothermic heat effect started at 63.3 °C, an exothermic reaction

followed at about 221 °C. After the experiment, the sample had lost about 96% of its mass and a

brown residue remained

Main Test

In order to determine the melting more precisely, further DSC-runs were recorded between 25 °C

and 100 °C with a heating rate of 10 °C/min. In the first main test run, the melting (measured as

the onset of the endothermic peak) was observed at 64.4 °C, during the second main test run at

64.8 °C. During these runs, the sample lost no weight and a milky melt remained.

Conclusions:
The melting point of cC6O4 ammonium salt was determined to be 64.6 °C, which is equal to 337.8 K.
The estimated accuracy is ± 0.5 K.
Executive summary:

The determination of the melting point/melting range of the test item was performed according

to the EEC Directive 92/69 and Council Regulation (EC) No. 440/2008, A.1 “Melting/Freezing

temperature“ and to the OECD Guideline No. 102: “Melting point / melting range“, adopted July

27, 1995.

The melting point of cC6O4 ammonium salt was determined to be 64.6 °C, which is equal to 337.8 K. This result was obtained at the onset of the endothermic peak using Differential Scanning Calorimetry (Thermal Analysis) method.

Description of key information

The determination of the melting point/melting range of the test item was performed according to the EEC Directive 92/69 and Council Regulation (EC) No. 440/2008, A.1 “Melting/Freezing temperature“ and to the OECD Guideline No. 102: “Melting point / melting range“, using a differential scanning calometry (thermal analysis).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
64.6 °C

Additional information