Sodium metaborate, anhydrous

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14/06/2010 to 15/06/2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

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

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 actiivty 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 probably due to evaporation of water from the sample. The downward temperature ramp did not show this to be a reversible reactions (e.g. melting).

Conclusions:

The melting point for sodium metaborate was observed to be > 500 °C. The sample was observed to undergo an endothermic event with an onset of 100 °C which was probably due to evaporation of water from the sample. The downward temperature ramp did not show this to be a reversible reactions (e.g. melting).

Executive summary:

The melting point study was performed under GLP compliance by differential scanning calometry. The melting point for 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 probably due to evaporation of water from the sample. The downward temperature ramp did not show this to be a reversible reactions (e.g. melting).

Description of key information

The melting point study was performed under GLP compliance by differential scanning calometry. The melting point for 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 probably due to evaporation of water from the sample. The downward temperature ramp did not show this to be a reversible reactions (e.g. melting).