Registration Dossier
Registration Dossier
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EC number: 209-406-4 | CAS number: 577-11-7
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- March to April 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- capillary method
- Melting / freezing pt.:
- >= 165 - <= 170 °C
- Decomposition:
- no
- Decomp. temp.:
- > 284 °C
- Conclusions:
- The melting point is within 165 - 170°C.
- Executive summary:
The melting point of AEROSOL OT 100% SURFACTANT with contains >97% Docusate Sodium was determined with the capillary method according to EU method A.1 in a non-GLP study to be within 165- 170°C. This temperature range was also obtained using the DSC method.
This melting range is considered to be relevant and reliable for the further risk assessment.
Reference
From the waxy sample a sharp melting point could not be determined. The observed melting range of AEROSOL® OT 100% Surfactant was 165-170 °C in both experiments using the calilary method.
Both methods for the determination of the melting point, i.e., the DSC method and the capillary method showed that AEROSOL® OT 100% Surfactant has not a single melting point but a melting range. The melting process resulted in an exothermal signal in the DSC measurement. The melting
point as determined with the capillary method is considered to be more relevant than the DSC measurement. The melting range of AEROSOL® OT 100% Surfactant is within 165 – 170 °C.
Description of key information
165 - 170 °C; mean 167.5 °C
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 167.5 °C
Additional information
In the non-GLP Klimisch 1 key study (Holzschuh 2010), the melting point of AEROSOL OT 100% SURFACTANT with contains >97% Docusate Sodium was determined. The test was performed using the capillary method according to EU method A.1. The melting range was determined to be within 165- 170°C. This temperature range was confirmed in the same study using the DSC method.
The experimentally determined melting range of 165 - 170°C is considered to be relevant and reliable for the further risk assessment. In order to provide a single value for the chemical safety assessment, the mean temperature of the melting range will be used for the further risk assessment, i.e., 167.5°C.
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