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Physical & Chemical properties

Melting point / freezing point

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Link to relevant study record(s)

Description of key information

The melting point of the dried solid THPS (100%) was determined between 54.2 and 81.5°C at ambient pressure and the freezing point of the THPS aqueous solution 75% gives a freezing temperature < -20 °C or 253K at ambient pressure.
The freezing point of commercial THPS 75% aqueous solution at ambient pressure is choosen for chemical safety assessment purposes.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-20 °C

Additional information

The melting point of the dried solid THPS (100%) was determined according to OECD 102 guideline under GLP using a capillary tube method.

The study report is well documented and report a melting range of THPS dried (100%) between 54.2 and 81.5°C at ambient pressure.

The freezing temperature of THPS aqueous solution (75%) was determined using the method for determination of crystallizing point (method EC A1) under GLP. The dry ice/ acetone bath was maintained until the temperature has reached approximately -20°C or until the test material solidified.

No solidification appeared until this temperature that gives a freezing temperature for THPS 75% < -20 °C or 253 K at ambient pressure.

The freezing point of THPS 75% aqueous solution at ambient pressure is choosen for chemical safety assessment purposes.

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