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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 August 2011 - 17 November 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: This study has been performed according to OECD and EC guidelines and in compliance with GLP principles.
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
(1995)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
(2008)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
other: differential scanning calorimetry (DSC)
Melting / freezing pt.:
173 °C
Remarks on result:
other: Reaction and/or decomposition of the test substance was observed during melting.
Melting / freezing pt.:
446 K
Remarks on result:
other: Reaction and/or decomposition of the test substance was observed during melting.

Preliminary test

From 375°C upwards the weight of the sample decreased significantly. At 435°C the sample weight had decreased by 25%. After the experiment, a black molten residue remained in the sample container (original colour: white to off-white). The change of the colour indicated reaction and/or decomposition of the test substance.

Main study

In the first experiment, an endothermic peak between 150°C and 200°C was observed. The extrapolated onset temperature of the peak was 172.96°C. The effect was most likely obtained due to melting of the test substance. After the experiment, a brown molten residue remained in the sample container.

To investigate reaction and/or decomposition, a lower heating rate was applied in the second experiment. The extrapolated onset temperature of the melting peak was 171.92°C. The similar value obtained demonstrated that melting of the test substance was the reason for the endothermic effect. After the experiment, a dark brown molten residue remained in the sample container.

To investigate the melting peak, the third experiment was stopped directly after melting. The extrapolated onset temperature of the melting peak was 173.04°C. After the experiment, a beige molten residue remained in the sample container. This indicated that reaction and/or decomposition occurred during melting of the test substance.

Conclusions:
The melting temperature of 3,3’-DDS was determined to be 173°C (446K) (DSC analysis). During melting, reaction and/or decomposition of the test substance was observed.

Description of key information

DETERMINATION OF PHYSICO-CHEMICAL PROPERTIES OF 3,3’-DDS, project 496966, 2011
Dr. Ir. E. Baltussen.
Study performed according to OECD and EC guidelines and in compliance with GLP principles.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
173 °C

Additional information

The melting temperature of 3,3’-DDS was determined to be 173°C (446K) (DSC analysis). During melting, reaction and/or decomposition of the test substance was observed.