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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:
2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Guideline compliant well documented study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
no
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
>= 175 °C
Decomposition:
yes
Decomp. temp.:
>= 175 °C
Remarks on result:
other: Up to 175 °C the sample shows a weight loss of ca. 3 weight%. From 175 °C the test item shows most probably a thermal decomposition with melting (melting >175 °C can not be excluded; the decomposition products seem to start melting at temperatures >175°C)

The test item Sodium di(1.3-dimethylbutyl) sulfosuccinate shows no melting of a crystalline main component up to 175 °C according to the definition in the OECD Guideline 102 (mean value from repeat determinations; 1stto 3rdheating run).

·        175 °C (from first measurement)

·        175 °C (from second measurement)

·        175 °C (from third measurement)

Up to 175 °C the sample shows a weight loss of ca. 3 weight%. From 175 °C the test item shows most probably a thermal decomposition with melting (a melting >175 °C cannot be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures >175 °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 100 °C and 120 °C the test item shows a small endothermic effect. This effect is possibly a melting of part components. Additional the sample shows another small reversible endothermic effect. This effect is possibly solid–solid phase transformations. These effects are not the melting of the test item (main component) which was verified by subsequent tests with the Kofler-heating bank and with the melting in a capillary.

The cooling runs show no crystallization of the main component.

Conclusions:
decomposition at >= 175°C
melting point > 175 °C
Executive summary:

In the Klimisch 1 non-GLP study from Bütfering (2012) the melting point of Sodium di(1.3-dimethylbutyl) sulfosuccinate was determined with the DSC method according to OECD 102 and EU method A.1. The test item shows no melting of a crystalline main component up to 175 °C according to the definition in the OECD Guideline 102. From 175 °C the test item shows most probably a thermal decomposition with melting (a melting >175 °C cannot be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures >175 °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

melting/decomposition temperature: 175°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
175 °C

Additional information

In the Klimisch 1 non-GLP study from Bütfering (2012) the melting point of Sodium di(1.3-dimethylbutyl) sulfosuccinate was determined with the DSC method according to OECD 102 and EU method A.1.The test item Sodium di(1.3-dimethylbutyl) sulfosuccinate shows no melting of a crystalline main component up to 175 °C according to the definition in the OECD Guideline 102.From 175 °C the test item shows most probably a thermal decomposition with melting (a melting >175 °C cannot be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures >175 °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 temperature of 175 °C will be used.

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