Registration Dossier

Diss Factsheets

Administrative data

boiling point
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is a solid which decomposes before boiling
Reason / purpose for cross-reference:
reference to other study
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 21, 1992
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
GLP compliance:
Type of method:
differential scanning calorimetry
Key result
Decomp. temp.:
>= 180 °C
Remarks on result:
other: The substance has no melting point.

Preliminary test

Two endothermic peaks, which partly overlap each other, were observed between about 180 and 330°C. At higher temperatures, around about 360°C possibly a small exothermic effect was detected. During the experiment the sample lost 7.99 mg (95%) of its mass and changed into a black powder.

Main study

- First run: this run was performed to investigate the run registered during the preliminary test. The endothermic effect started at about 190°C. The sample lost 4.95 mg (56%) of its mass during this run; it was changed into a yellow/brown powder.

- Second run: during this run, the endothermic effect which was observed in the 1st run could not be detected, which implies that it was caused by an irreversible process, e.g. evaporation, reaction and/or decomposition of (part of) the test substance. The second endothermic effect started at about 247°C. After this run, the sample appeared to be a dark brown powder; it had lost 3.50 mg (40%) of its mass.

- Third run: no endothermic heat effect was observed.; therefore also the second observed endothermic peak is considered to be caused by an irreversible process, e.g. evaporation, reaction and/or decomposition of (part of) the test substance. Between about 275 and 357°C a base-line shift was observed. It is not clear what process caused this shift. The sample lost 0.02 mg (0.2%) of its mass; the residue was a black powder.

The substance has no melting point up 180°C. At temperatures above 180°C the substance evaporates, reacts and/or decomposes.
Executive summary:

In accordance with EU Method A.1 (1989) and according to GLP principles the melting point of the substance (a solid under ambient conditions) was determined using DSC. It was found that the substance has no melting point. Evaporation, reaction and/or decomposition of the substance starts at 180°C.

Data source

Materials and methods

Results and discussion

Applicant's summary and conclusion