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EC number: 607-813-5
CAS number: 25830-77-7
TGA EXPERIMENT (PRELIMINARY TEST)
From 250°C upwards the weight of the sample decreased significantly. At
352°C the sample weight had decreased by 25%. After the experiment, a
brown/black molten residue remained in the sample container (original
colour: white). The change of the colour indicated reaction and/or
decomposition of the test item.
DSC EXPERIMENT 1
An endothermic peak between 125°C and 150°C was observed (unknown
effect). An endothermic peak between 175°C and 225°C was observed
(extrapolated onset temperature: 204.21°C). The effect was most likely
obtained due to melting of the test item. An exothermic peak started
from 325°C due to reaction and/or decomposition of the test item. After
the experiment, a brown/black molten residue remained in the sample
DSC EXPERIMENT 2
To investigate the melting peak between 175°C and 225°C a repeated
heating cycle was applied. With the first heating the extrapolated onset
temperature of the melting peak was 204.13°C. During cooling a glass
transition was observed between 25°C and 50°C. With the second heating a
glass transition was observed between 50°C and 75°C (inflection point:
58.83°C). An exothermic peak between 100°C and 150°C was observed due to
crystallization. An endothermic peak between 175°C and 225°C was
observed (extrapolated onset temperature: 196.41°C). The effect was most
likely obtained due to melting and reaction and/or decomposition of the
test item. After the experiment, a yellow molten residue remained in the
DSC EXPERIMENT 3
To investigate the endothermic peak between 125°C and 150°C a repeated
heating cycle was applied in the Experiment 3. During cooling no effects
were observed. With the second heating no effects were observed. Since
no weight loss was observed during the preliminary test between 125°C
and 150°C, it is possible but not likely that the endothermic peak was
due to evaporation of volatile components. A rearrangement of the
crystal structure also might be the reason for this peak. After the
experiment, the sample appeared to have been unchanged, i.e. no
decomposition and/or evaporation were observed.
DSC EXPERIMENT 4
To investigate reaction and/or decomposition during melting, heating was
stopped directly after the melting peak. The extrapolated onset
temperature of the melting peak was 204.12°C. After the experiment, an
off-white molten residue remained in the sample container. This is
an indication that reaction and/or decomposition occurred during melting
of the test item.
The melting temperature was determined as the average melting
temperature obtained from Experiment 1 (204.21°C), Experiment 2
(204.13°C) and Experiment 4 (204.12°C).
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 to be 204°C. Reaction and/or
decomposition was observed during and after melting.
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