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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Reference:
Composition 0
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
no
Type of method:
thermal analysis
Remarks:
Differential Thermal Analysis (DTA) / Differential Scanning Calorimetry (DSC)
Test material information:
Composition 1
Specific details on test material used for the study:
- Purity not specfied
- Batch number: UN100EK
Key result
Melting / freezing pt.:
100 - 130 °C
Decomposition:
yes
Remarks on result:
other: mean of two determinations in an open crucible

RESULTS:

1. Thermal stability and decomposition:

- At room temperature the test item is a powdery solid

- Between approx. 65 °C – 140 °C an endothermic phase could be detected which indicates the melting range

- After the melting process an endothermic phase between 145 and 160 °C which went over directly to a exothermic phase between approx. 160 -215 °C was observed; this exothermic phase indicates transformation and decomposition, respectively, of the test item

2. Melting Point:

- Endothermic effects were visible already at 65 °C (These effects lead to the assumption that, while melting, transformation and decomposition could occurre)

- In the closed crucible no melting could be observed

The test item recrystallized after the melting process:

- In the open crucible the residue was a light orange powder

- In the closed crucible the residue was a dark red-brownish melt which indicates transformation of the substance

Conclusions:
The melting range lies between 100 and 130°C and no pressure was reported.
Executive summary:

A differential thermoanalysis method (DTA) was used to determine the melting point which conforms with the procedure Test method A.1, "Determination of the melting point", described in the EC-Guideline. The melting temperature was observed in a range between 100 and 130 °C (mean of two determinations in an open crucible). Endothermic effects were visible already at 65 °C. These effects lead to the assumption that, while melting, transformation and decomposition could occurre. In the closed crucible no melting could be observed. Bromhydrin-valerat recrystallized after the melting process. In the open crucible the residue was a light orange powder. In the closed crucible the residue was a dark red-brownish melt which indicates transformation of the substance.

Description of key information

The melting range lies between 100 and 130°C and no pressure was reported.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
115 °C

Additional information

Endothermic effects were visible already at 65 °C. These effects lead to the assumption that, while melting, transformation and decomposition occurred. In the closed crucible no melting could be observed. Bromhydrin-valerat recrystallized after the melting process.