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Physical & Chemical properties

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:
2002
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 27, 1995
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
EEC Publication No. L383, December 1992
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- batch No.of test material: 62630012
- Expiration date of the lot/batch: 01.11.2002
- Purity: 94.0 %

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: at room temperature in the dark.
Key result
Melting / freezing pt.:
101 °C
Decomposition:
yes
Decomp. temp.:
148 °C
Key result
Melting / freezing pt.:
374 K
Decomposition:
yes
Decomp. temp.:
421 K

Probably because of a small amount of impurities, the melting process started already at 75°C (348 K).

Conclusions:
The melting temperature of Phytosphingosine was determined to be 101°C (374 K). Probably because of a small amount of impurities, the melting process started already at 75°C (348 K).
Reaction or decomposition started at 148°C (421 K). Boiling of the test substance was not observed below the temperature at which reaction or decomposition started.
Executive summary:

From the endothermic melting peak, the melting temperature of Phytosphingosine was determined to be 101°C. The observed second small endothermic peak between 143°C and approximately 150°C may be caused by further melting (possibly some components or impurities with higher melting temperatures). It is also possible that the test substance shows liquid crystalline behaviour. In that case, the second peak may be caused by the transition from the liquid crystalline state to the isotropic liquid state. The observed exothermic effect was probably caused by reaction or decomposition of the test substance.

Description of key information

The melting temperature of Phytosphingosine was determined to be 101°C (374 K). Probably because of a small amount of impurities, the melting process started already at 75°C (348 K).

Reaction or decomposition started at 148°C (421 K). Boiling of the test substance was not observed below the temperature at which reaction or decomposition started.

Key value for chemical safety assessment

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

Additional information