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EC number: 947-655-7
CAS number: -
In the melt microscope beginning at a
temperature of 165 °C the colour of the specimen starts to change from
white to slightly yellowish brown, at 180 °C it appears reddish-brown.
At 254 °C the specimen is of brown colour and starts to become liquid,
at 255 °C a clear, brown liquid was obtained.
In the TGA test, a sample of the test item
was heated from 30 °C to 675 °C in an inert gas atmosphere (N2).
Starting at 30 °C a nearly constantly increasing weight loss was
recorded. Until 240 °C (238.7 °C estimated onset) it lost 12.2 % of its
weight. Above 238.7 °C (estimated onset) the weight loss increases
significantly. At 670 °C a total loss of loss of approx. 72 % was
During the first heating period of the
preliminary DSC test, an endothermic signal was recorded over a
temperature range of approximately 30 °C … 170 °C. Thus, a second DSC
test was focussed on the evaluation of this endothermic, however, as no
re-crystallisation signal could be recorded in any cooling run (1st) and
no phase transitions was observed in any successive heating or procedure
this endothermic is possibly attributed to a solid-solid phase
transformation, but not to a melting behaviour of the main component.
This corresponds to the visual observation where the substance remained
solid until 254 °C.
At the 2nd heating run of the preliminary
DSC test the sample was heated up to 255 °C. The recorded
discontinuities above 231.8 °C (estimated onset) indicate a beginning
decomposition of the test item, which corresponds to the increasing
weight loss and the visual observation in the melt microscope (colour
In order to provide evidence for this
assumption, a degradation test was performed during which 21.6204 mg of
the sample were heated to 255°C for 5 minutes (visually observed melting
point) and the remaining residue war characterised by NMR spectroscopy.
A weight loss of 31.7 % was recorded and according to the NMR analysis,
the residue provided a huge amount of underivatised sulfonatosuccinic
acid, which indicates a degradation of the ester bond.
No thermodynamic melting point could be
identified up to beginning degradation at 232 °C (1010 hPa).
The boiling temperature of the
freeze-dried test material was determined with the DSC method according
to OECD 103 and EU method A.2 in a non-GLP study to be >232°C. At 232°C,
decomposition was observed.
This information on the boiling
temperature is considered to be relevant and reliable for the further
boiling point > 232°C (decomposition
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