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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:
14 September 2017 – 04 January 2018
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
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
> 500 °C

Endotherms were noted at 143.12°C and 240.34°C, however, upon completion of the DSC testing the sample remained unchanged; therefore the endothermic events observed during the test are not associated with melting. The melting point of the sample was therefore determined to be >500°C.

Conclusions:
The melting point of dilithium tetraborate was determined using differential calorimetey according to EU Method A.1. The melting point of the test item was therefore determined to be >500°C.
Executive summary:

The melting point of dilithium tetraborate was determined using differential calorimetry according to EU Method A.1. A sample of dilithium tetraborate was charged to an open aluminium DSC crucible which was placed in the furnace. The sample was then ramped from 25°C to 500°C at 10 K.min-1. Endotherms were noted at 143.12°C and 240.34°C, however, upon completion of the DSC testing the sample remained unchanged; therefore the endothermic events observed during the test are not associated with melting. The melting point of the sample was therefore determined to be >500°C.

Description of key information

The melting point of dilithium tetraborate was determined using differential calorimetry according to EU Method A.1.  The melting point of the sample was therefore determined to be >500°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
500 °C

Additional information