Sodium 1,2-diisobutoxycarbonylethanesulphonate

Melting point / freezing point

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:

guideline study

Remarks:

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)

Deviations:

no

GLP compliance:

no

Type of method:

thermal analysis

Key result

Melting / freezing pt.:

>= 200 °C

Decomposition:

yes

Decomp. temp.:

>= 164 °C

Remarks on result:

other: From 164 °C the test item shows most probably a thermal decomposition with melting (a melting >200 °C can not be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >200 °C)

The test item Butandioic acid, sulfo-, 1,4-bis(2-methylpropyl)ester, sodium salt shows no melting of crystalline subcomponents up to 164 °C according to the definition in the OECD Guideline 102 (mean value from repeat determinations; 1^stto 4^thheating run).

·        164 °C (from first measurement)

·        164 °C (from second measurement)

Up to 164 °C the sample shows a weight loss of ca. 4-5 weight%. From 164 °C the test item shows most probably a thermal decomposition with melting (a melting >200 °C can not be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >200 °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 150 °C the test item shows two endothermic effects (see 2. + 3. heating run). These effects are 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.

 

The DSC measurements were confirmed by means of TGA measurement (up to 164 °C the sample shows a weight loss of ca. 4-5 weight%) under the same measuring conditions

Conclusions:

decomposition at >= 164°C
melting point > 200°C

Executive summary:

In the non-GLP klimisch 1 key study from Kintrup (2012) the melting point of Butandioic acid, sulfo-, 1,4-bis(2-methylpropyl)ester, sodium salt was determined with the DSC method according to OECD 102 and EU method A.1. No melting was observed up to 164°C. From 164 °C the test item shows most probably a thermal decomposition with melting (a melting >200 °C can not be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >200 °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.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

164 °C

Additional information

In the non-GLP klimisch 1 key study from Kintrup (2012) the melting point of Butandioic acid, sulfo-, 1,4-bis(2-methylpropyl)ester, sodium salt was determined with the DSC method according to OECD 102 and EU method A.1. No melting was observed up to 164°C.From 164 °C the test item shows most probably a thermal decomposition with melting (a melting >200 °C can not be excluded, due to the information of the Kofler-heating bank; the decomposition products seem to start melting at temperatures >200 °C) and evaporation of the decomposition components. A vaporization of significant parts of the test item cannot be completely excluded.

For the risk assessment the lowest possible melting point will be used, i.e., 164°C.

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