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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Melting point [2,4,6-trimethyl-2,4,6-tris(3,3,3-trifluoropropyl)cyclotrisiloxane]: Trans-form: 35°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
35 °C

Additional information

2,4,6 -Trimethyl-2,4,6-tris(3,3,3-trifluoropropyl)cyclotrisiloxane occurs as two geometric isomers. The melting point of the substance is influenced by which isomer is in highest proportion. A measured melting point of 35°C was determined for the trans form (99.5% trans) of the substance. When the cis form is about 85% (eutectic), the substance was reported to have a melting point of -7°C and when the percentage of the cis-form is about 96%, a melting point of -1.9°C was reported. The key study is supported by melting point values of -15.5°C, 35.2°C and 34.5 - 35°C which were reported for the two isomers of the substance (no ratio of isomers reported) in secondary sources to which reliability could not be assigned.