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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Potassium thiosulfate has no melting in the temperature range of 25-600°C (melting point >600 °C) (study result)

Key value for chemical safety assessment

Additional information

For the evaluation of this endpoint data from an experimental study were used as key information. The study was conducted according to GLP and according to OECD guidelines 113 (screening for thermal stability) and 102 (determination of meting point). The test data are considered as reliable without restrictions.

The thermal stability and the determination of the melting point were carried out by DSC analysis. The test item and the standard material (aluminium oxide) were heated up from ambient temperature to the final temperature (450°C and 600°C, respectively) at a constant heating rate under nitrogen. Closed class crucibles were used as containers for the screening test and aluminium crucibles with a small hole were used in the main test. The quantity of heat absorbed or released was measured and recorded.

Results indicate that potassium thiosulfate has no melting in the temperature range of 25-600°C.