Registration Dossier

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

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:
5 October to 13 November 1998
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
other: Differential Scanning Calorimetry.
Melting / freezing pt.:
157.4 °C
Decomposition:
yes
Decomp. temp.:
>= 180 - <= 350 °C

The determination of the melting point by DSC, Mettler-Toledo TA8000, were carried out in closed glass pan and in closed aluminium pan. The measurement in the closed glass pan shows an endothermic effect (melting) in the range 130-170 °C and a decomposition of the test substance in the range 180-350 °C, with a decomposition energy of 1243 J/g. So the test for explosive properties has to be performed. In the aluminium pan the diagram shows a broad endothermal effect in the range 115-170 °C.

Mean melting point is 157.4 °C.

Ident. No.

onset temperature / °C

3606*

159.7

3607

156.8

3608

158.0

*glass

Conclusions:
Mean melting point is 157.4 °C
Executive summary:

Study data conducted to Guideline 92/69/EEC of 31 July 1992, Annex. Part A: Methods for the determination of physico-chemical properties. A.1. melting point / melting range by differential scanning calorimetry (DSC) in accordance to GLP.The mean melting point is 157.4 °C with decomposition of the test substance in the range 180-350 °C, with a decomposition energy of 1243 J/g.

Description of key information

Mean melting point is 157.4 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
157.4 °C

Additional information

Study data conducted to Guideline 92/69/EEC of 31 July 1992, Annex. Part A: Methods for the determination of physico-chemical properties. A.1. melting point / melting range by differential scanning calorimetry (DSC) in accordance to GLP.The mean melting point is 157.4 °C with decomposition of the test substance in the range 180-350 °C, with a decomposition energy of 1243 J/g.