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Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
15/06/2010 to 16/06/2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
comparable to guideline study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Principles of method if other than guideline:
A quantity of sample, normally 5 - 10 mg, is sealed into a test crucible and placed in a furnace cell along with an empty reference pan. The furnace is allowed to equilibrate to the starting temperature and both pans are then heated at a constant rate between 0.5 and 20 K/min until the final temperature is reached. The temperature of the sample and that of the reference pan are monitored. Any exothermic activity within the sample results in a larger heat flow out of the cell relative to the reference pan. All data is logged using a microcomputer.
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Melting / freezing pt.:
> 500 °C
Remarks on result:
other: The sample was observed to undergo an endothermic event with an onset of 100 °C which was due to evaporation of water from the sample and not the sample melting as no re-crystallisation was observed during cooling down.

The melting point for dipotassium tetraborate was observed to be > 500 °C. The sample was observed to undergo an endothermic event with an onset of 100 °C which was due to evaporation of water from the sample and not the sample melting as no re-crystallisation was observed during cooling down.

Conclusions:
The melting point for the sample was observed to be > 500 °C. The sample was observed to undergo an endothermic event with an onset of 100 °C which was due to evaporation of water from the sample and not the sample melting as no re-crystallisation was observed during cooling down.
Executive summary:

The melting point study was performed under GLP compliance via differential scanning calometry. The melting point for the test item was observed to be > 500 °C. The sample was observed to undergo an endothermic event with an onset of 100 °C which was due to evaporation of water from the sample and not the sample melting as no re-crystallisation was observed during cooling down.

Description of key information

The melting point study was performed under GLP compliance via differential scanning calometry. The melting point for the test item was observed to be > 500 °C. The sample was observed to undergo an endothermic event with an onset of 100 °C which was due to evaporation of water from the sample and not the sample melting as no re-crystallisation was observed during cooling down.

Key value for chemical safety assessment

Additional information