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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:
2016-03-18 to 2016-08-10
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline 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:
yes (incl. QA statement)
Type of method:
capillary method
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Colour and appearance: Colourless solid
- Batch: C14-193
- Purity: 100% (w/w)
- Expiry date: 15 Dec 2016


STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: ambient (+5 to 30 °C), dark, dry

OTHER SPECIFICS
- Dry and finely ground test item
Key result
Melting / freezing pt.:
> 400 °C

The test was started at 100 °C with a heating rate of 5 K/min. At about 300 °C the colour of the test item changed to grey but it remained powdery. The test item did not melt up to a temperature of 400 °C. A higher temperature could not be achieved with the apparatus. Therefore, the melting point of the test item is defined to be above 400 °C (673.15 K).

Conclusions:
The melting point of the test item is defined to be above 400 °C (673.15 K).
Executive summary:

For the determination of the melting point the capillary method was used according to OECD 102. A small amount of the finely ground test item was placed in a capillary tube and packed tightly. The tube was heated in a metal heating block in a rate of 5 K/min starting at 100 °C. At about 300 °C the colour of the test item changed to grey but it remained powdery. The test item did not melt up to a temperature of 400 °C. A higher temperature could not be achieved with the apparatus. Therefore, the melting point of the test item is defined to be above 400 °C (673.15 K).

Description of key information

For the determination of the melting point the capillary method was used according to OECD 102. A small amount of the finely ground test item was placed in a capillary tube and packed tightly. The tube was heated in a metal heating block in a rate of 5 K/min starting at 100 °C. At about 300 °C the colour of the test item changed to grey but it remained powdery. The test item did not melt up to a temperature of 400 °C. A higher temperature could not be achieved with the apparatus. Therefore, the melting point of the test item is defined to be above 400 °C (673.15 K).

Key value for chemical safety assessment

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