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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Guideline compliant well documented study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
no
Type of method:
thermal analysis
Melting / freezing pt.:
>= 235 °C
Decomposition:
yes
Decomp. temp.:
>= 235 °C
Remarks on result:
other: From 235 °C the test item shows thermal decomposition with melting (a melting >235 °C can not be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting).

The test item Sodium bis(C11-14-isoalkyl, C13-rich) sulfosuccinate shows no melting of a crystalline main component up to 235 °C according to the definition in the OECD Guideline 102 (mean value from repeat determinations; 1st to 4th heating run).

·        235 °C (from first measurement)

·        235 °C (from second measurement)

Up to 235 °C the sample shows a weight loss of ca. 2 weight%. From 235 °C the test item shows most probably a thermal decomposition with melting (a melting >235 °C cannot be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >235 °C) and evaporation of the decomposition components. A vaporization of significant parts of the test item cannot be completely excluded.

 

In the temperature range between about -60 °C and 140 °C the test item shows two small endothermic effects (see 1. - 3. heating run). These effects are possibly a melting of part components. These effects are not the melting of the test item (main component) which was verified by subsequent tests with the Kofler-heating bank.

The cooling runs show no crystallization of the main component.

The DSC measurements were confirmed by means of TGA measurement (up to 235 °C the sample shows a weight loss of ca. 2 weight%) under the same measuring conditions.

Conclusions:
decomposition at >= 235°C
melting point > 235 °C
Executive summary:

In the Klimisch 1 non-GLP study from Kintrup (2013) the melting point of Sodium bis(C11-14-isoalkyl, C13-rich) sulfosuccinate was determined with the DSC method according to OECD 102 and EU method A.1. The test item did not show melting up to 235 °C. Up to 235 °C the sample shows a weight loss of ca. 2 weight%. From 235 °C the test item shows most probably a thermal decomposition with melting (a melting >235 °C cannot be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >235 °C) and evaporation of the decomposition components. A vaporization of significant parts of the test item cannot be completely excluded.

This information is considered to be relevant and reliable for the further risk assessment.

Description of key information

From 235 °C the test item shows most probably a thermal decomposition with melting (a melting >235 °C cannot be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >235 °C) and evaporation of the decomposition components. A vaporization of significant parts of the test item cannot be completely excluded.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
235 °C

Additional information

In the Klimisch 1 non-GLP study from Kintrup (2013) the melting point of Sodium bis(C11-14-isoalkyl, C13-rich) sulfosuccinate was determined with the DSC method according to OECD 102 and EU method A.1. The test item did not show melting up to 235 °C. Up to 235 °C the sample shows a weight loss of ca. 2 weight%. From 235 °C the test item shows most probably a thermal decomposition with melting (a melting >235 °C cannot be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >235 °C) and evaporation of the decomposition components. A vaporization of significant parts of the test item cannot be completely excluded.

For the risk assessment, a melting point of 235 °C will be used.

This information is considered to be relevant and reliable for the further risk assessment.