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Physical & Chemical properties

Melting point / freezing point

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Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline compliant well documented study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
no
Type of method:
thermal analysis
Melting / freezing pt.:
>= 208 °C
Decomposition:
yes
Decomp. temp.:
>= 208 °C
Remarks on result:
other: In the temperature range between about 30 °C and 100 °C the test item shows a reversible endothermic effect. This effect is possibly a solid state transformation. The decomposition products seem to start melting at > 300 °C.

The test item Aspartic acid, N-(3-carboxy-1-oxo-sulfopropyl)-N-(C16-18 (even numbered), C18 unsaturated alkyl) tetrasodium salts shows no melting of crystalline subcomponents up to 208 °C according to the definition in the OECD Guideline 102 (mean value from repeat determinations;1stto 4thheating run).

 

·        208 °C (from first measurement)

·        208 °C (from second measurement)

·        208 °C (from third measurement)

 

Up to 208 °C the sample shows a weight loss of ca. 5-6 weight%. From 208 °C the test item shows most probably a thermal decomposition with melting (a melting > 300 °C cannot be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures > 300 °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 30 °C and 100 °C the test item shows a reversible endothermic effect (see 2. + 3. heating run). This effect is possibly a solid–solid phase transformation. This effect is 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.

 

The DSC measurements were confirmed by means of TGA measurements (up to 208 °C the sample shows a weight loss of ca. 5-6 weight%) under the same measuring conditions.

Conclusions:
decomposition at >= 208°C
melting point > 208 °C
Executive summary:

In the Klimisch 1 non-GLP study from Kintrup (2012) the melting point of Aspartic acid, N-(3-carboxy-1-oxo-sulfopropyl)-N-(C16-18 (even numbered), C18 unsaturated alkyl) tetrasodium salts was determined with the DSC method according to OECD 102 and EU method A.1. The test item did not show melting up to 208°C.Up to 208 °C the sample shows a weight loss of ca. 5-6 weight%. From 208 °C the test item shows most probably a thermal decomposition with melting (a melting > 300 °C cannot be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures > 300 °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 208°C will be used.

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

Description of key information

melting/decomposition: >= 208°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
208 °C

Additional information

In the Klimisch 1 non-GLP study from Kintrup (2012) the melting point of Aspartic acid, N-(3-carboxy-1-oxo-sulfopropyl)-N-(C16-18 (even numbered), C18 unsaturated alkyl) tetrasodium salts was determined with the DSC method according to OECD 102 and EU method A.1. The test item did not show melting up to 208°C.Up to 208 °C the sample shows a weight loss of ca. 5-6 weight%. From 208 °C the test item shows most probably a thermal decomposition with melting (a melting > 300 °C cannot be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures > 300 °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 208°C will be used.

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