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EC number: 630-473-4
CAS number: 14595-54-1
4.2/1: Results of the DSC-measurements
Onset of Effect (°C)
Range of effect (°C)
Air pressure (hpa)
21 to 22 (exo)
-39 to -38 (exo)
-50 to -25 (endo)
-10 to 10 (endo)
15 to 35 (endo)
230 to 380 (endo)
230 to 370 (endo)
the cooling to a temperature of -100 °C
sharp exothermic effects could be observed in a temperature range from
-39 to 22 °C,
which can be assigned to the freezing of the test item. As there are two
exothermic signals, the test item has a freezing range from -39 to 20 °C
evaluating minimum and maximum onset temperatures of the effects. During
the subsequent heating phase three distinct endothermic effects were
observed in the temperature range from -50 to 35 °C,
which can be assigned to the melting of the test item. As there are
three endothermic signals, the test item has a melting range from -38 to
evaluating minimum and maximum onset temperatures of the effects.
observation of more than one melting point might be caused by the
existence of different isomers of the test item. Here, for example, the
keto-enol automatism can lead to three different stable isomers of the
test substance. Another explanation might be the existence of ring
conformational isomerism which can lead to several stable conformers.
points of the test substance were determined under GLP according to EU
Method A.1 and OECD 102, by differential scanning calorimetry (DSC). Two
main runs were performed, and the average of the onset temperatures was
test item undergoes freezing in two steps at +20°C and -39°C,
three steps from -38
to 23 °C,
atmospheric pressure (1009 hPa) under nitrogen.
The phenomenon may be due to isomerism (or crystal rearrangement) of the
2-step Freezing in the range from +20°C to -39°C.3-step Melting in the range from -38°C to 23°C (both results at atmospheric pressure 1009 hPa under nitrogen)
A fully reliable experimental study,
conducted according to a recognized OECD/EC method and under GLP, is
available. It is considered as a key study. As both transitions occur in multi-step,
the results are expressed as a melting/freezing range, and cannot be retained
as (single) key value.
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