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Boiling point

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Endpoint:
boiling 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:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
>= 247 °C
Atm. press.:
990 mBar
Decomposition:
yes
Decomp. temp.:
>= 247 °C
Remarks on result:
other: From 247 °C the test item shows a boiling and/or thermal decomposition with evaporation of the decomposition components.

The test item Sodium dicyclohexyl sulfosuccinate shows boiling and/or thermal decomposition at ca. 247 °C (at 990 mbar) (a decomposition is most likely due to a strong residue in the crucible at ca. 600 °C (see TGA measurements)) according to the definition in the OECD guideline 103 (mean value from repeat determination; 1stheating run).

·        247 °C (from first measurement)

·        247 °C (from second measurement)

·        247 °C (from third measurement)

From 247 °C the test item shows a boiling and/or thermal decomposition with evaporation of the decomposition components.

The DSC measurements were confirmed by means of TGA measurements (up to 247 °C the sample shows a weight loss of ca. 2-3 weight%) under the same measuring conditions:

Conclusions:
boiling/decomposition at 247°C
Executive summary:

In the Klimisch 1 non-GLP study from Kintrup (2012) the boiling point of Sodium dicyclohexyl sulfosuccinate was determined with the DSC method according to OECD 103 and EU method A.2. The test item shows boiling and/or thermal decomposition at ca. 247 °C(at 990 mbar) (a decomposition is most likely due to a strong residue in the crucible at ca. 600 °C (see TGA measurements)) according to the definition in the OECD guideline 103.

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

Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Guideline compliant study with good documentation
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Boiling pt.:
249.9 °C
Decomposition:
yes
Decomp. temp.:
> 199.8 °C
Remarks on result:
other: After the test substance melted, it turned brown and then solidified into a crusty residue. After the test substance boils, it decomposes.

 

The average boiling point for the test substance is 249.9°C. After the test substance boils, it decomposes. This is confirmed by the shape of the DSC curve and by the observations made on the Optimelt. After the test substance melted, it turned brown and then solidified into a crusty residue.

Table 1 – Boiling Point of Test Substance, S20302-54 - AEROSOL® A196 97% Surfactant

 Specimen No.

Experimental Boiling Point (°C)

Literature

Value (°C)

Sample

1

249.6

**

Test Substance

2

250.2

**

1

110.5

110.6

Toluene

2

110.5

110.6

1

248.7

249

Benzoic Acid

2

249.2

249

 

Conclusions:
boiling point: 249.9 °C
Executive summary:

The boiling point of the test substance was determined by DSC. Duplicate specimens of the test substance were encapsulated in Al pans with pierced lids. Specimens were scanned at 10°C/min under nitrogen flowing at 45 mL/min. Toluene and benzoic acid were used as a reference to test the method. The DSC method has an estimated accuracy of ±0.5°C. Observations of the test substance were also done using the Optimelt (capillary melting point apparatus).

 

The average boiling point for the test substance is 249.9°C. After the test substance boils, it decomposes. This is confirmed by the shape of the DSC curve and by the observations made on the Optimelt. After the test substance melted, it turned brown and then solidified into a crusty residue.

Description of key information

boiling point or decomposition: 247°C

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
247 °C

Additional information

For the determination of the boiling point, two studies Klimisch 1 are available.

 

In the Klimisch 1 non-GLP study from Kintrup (2012) the boiling point of Sodium dicyclohexyl sulfosuccinate was determined with the DSC method according to OECD 103 and EU method A.2.The test item shows boiling and/or thermal decomposition at ca. 247 °C(at 990 mbar) (a decomposition is most likely due to a strong residue in the crucible at ca. 600 °C (see TGA measurements)) according to the definition in the OECD guideline 103.

In the Klimisch 1 non -GLP study (Rivera 2011) the boiling point of Sodium dicyclohexyl sulfosuccinate was also determined by DSC. Duplicate specimens of the test substance were encapsulated in Al pans with pierced lids. Specimens were scanned at 10°C/min under nitrogen flowing at 45 mL/min. Toluene and benzoic acid were used as a reference to test the method. The DSC method has an estimated accuracy of ±0.5°C. Observations of the test substance were also done using the Optimelt (capillary melting point apparatus). The average boiling point for the test substance is 249.9°C. After the test substance boils, it decomposes. This is confirmed by the shape of the DSC curve and by the observations made on the Optimelt. After the test substance melted, it turned brown and then solidified into a crusty residue.

 

Both studies were performed and documented on a high level and the results differ only by 2.9°C. For the risk assessment, the more conservative value, i.e., 247°C will be used. This result is considered relevant and reliable for the risk assessment.