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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Comparable to OECD 102 (Differential scanning calorimetry and Thermogravimetry)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
338 K

Additional information

The melting behavior was found to be dependent on the content of crystal water.

The melting point of Sodium perborate tetrahydrate was detected by Differential scanning calorimetry showing an endothermic peak in the heat flow curve at 65 °C. The substance melted in its own water of crystallisation. In the Thermogravimetry study, different steps for the degradation could be detected:

1. step: 20 − 150 °C (release of crystall water, formation of sodium perborate monohydrate)

2. step: 150 - 400 °C (release of remaining crystall water and degradation under release of oxygen)

Sodium perborate monohydrate decomposites at 150 °C, as determined by Differential scanning calorimetry. Two steps for the degradation could be detected by Thermoagravimetry:

1. step: 20 − 180 °C (release of water of constitution and beginning degradation)

2. step: 180 − 400 °C (degradation under release of oxygen)