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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-12 °C

Additional information

Potassium and Sodium form a eutectic mixture whereby the melting point of the mixture is lower than that of the two component metals. The point of maximum depression, i.e. the minimum melting point is at a composition of 78% potassium and 22% sodium, which is the composition of the alloy being registered. Based on available data, the melting point at this minimum, which represents the composition being registered, is around -12C and therefore the substance will be a liquid under most ambient conditions.