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EC number: 608-630-3
CAS number: 31528-46-8
A test substance sample was observed to be a
fine off-white powder with some clusters.
From observations using a 3.2 objective
lens, the particles appeared to be irregular shaped crystals.
From observations using a 40 objective lens,
the sample was observed to be made up of single crystalline particles.
Two experiments were performed to
investigate the melting and boiling behaviour of the substance.
DSC EXPERIMENT 1
An endothermic peak was observed
between 200°C and 250°C followed by an exothermic effect starting at
275°C (see the illustration below). The extrapolated onset temperature
of the first peak was 242.969°C. The endothermic effect was most likely
caused by melting of the test item. The exothermic effect was
probably caused by reaction and/or decomposition of the
After the experiment, a dark brown
molten residue remained in the sample container (original colour:
off-white). The change of the colour indicated reaction and/or
decomposition of the test item.
DSC EXPERIMENT 2
In order to investigate the melting
peak, in Experiment 2 heating was stopped directly after the melting
effect. The extrapolated onset temperature was 242.887°C. After the
experiment, a white molten residue remained in the sample container. It
demonstrated that melting was the reason for the endothermic effect.
The melting temperature was determined
as the mean melting temperature of Experiment 1 and Experiment 2.
Differential Scanning Calorimetry (DSC)
experiments were performed in a GLP study according to EC A.1, OECD 102
and OPPTS 830.7200.
The melting temperature of the substance was
determined in duplicate obtaining a mean value of 242.9°C.
and/or decomposition of the substance was observed at temperatures >
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