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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:
2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
no
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
> 229 °C
Decomposition:
yes
Decomp. temp.:
> 229 °C
Remarks on result:
other: Possible degradation prior to reaching the melting point

The test item Reaction products of ricinoleic acid with 2-aminoethanol and maleic acid and sodium hydrogensulfite shows no melting of crystalline subcomponents up to 229 °C according to the definition in the OECD Guideline 102 (mean value from repeat determinations; 1st to 4th heating run). 229 °C (from first measurement) 229 °C (from second measurement) 229 °C (from third measurement) Up to 229 °C the sample shows a weight loss of ca. 5-6 weight%. From 229 °C the test item shows most probably a thermal decomposition with melting (a melting between 229 °C and 300 °C can not be excluded, due to the information of the capillary method; the decomposition products seem to start melting at temperatures between 229 °C and 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 20 °C and 90 °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 229 °C the sample shows a weight loss of ca. 5-6 weight%) under the same measuring conditions.

Conclusions:
Melting point > 229°C. Above that temperature, decomposition started.
Executive summary:

The In the non-GLP Klimisch 1 study from Kintrup (2012) the melting point of Reaction products of ricinoleic acid with 2-aminoethanol and maleic acid and sodium hydrogensulfite was determined with the DSC method according to OECD 102 and EU method A.1 in a non-GLP study to be above 229 °C. Above that temperature, decomposition started.

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

Description of key information

Melting/decomposition: 229 °C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
229 °C

Additional information

In the non-GLP Klimisch 1 study from Kintrup (2012) the melting point of Reaction products of ricinoleic acid with 2-aminoethanol and maleic acid and sodium hydrogensulfite was determined with the DSC method according to OECD 102 and EU method A.1 in a non-GLP study to be above 229 °C. Above that temperature, decomposition started.

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

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