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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

Melting point / freezing point

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Description of key information


Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
197 °C

Additional information

Differential Scanning Calorimetry was performed using a Mettler-Toledo TGA/DSC Instrument in a Mono Potassium Phosphite sample.

From DSC thermal analysis, two endothermic events have been recorded, the first one very faint between 133 - 143 °C (AH = -0.51 J/g; onset = 135°C), the second between 189 - 194 °C (AH = -24.6 J/g; onset = 197 °C), both the endotherms can be related to the melting of the sample.