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Physical & Chemical properties

Boiling point

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Description of key information

Boiling point (2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane): 220°C (QSAR)

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
220 °C

Additional information

There are no reliable measured boiling point data for the registered substance. A predicted boiling point of 220°C was determined for the registered substance, Vi4-D4, using a validated QSAR estimation method. The result is considered to be reliable and was selected as key study. This value is supported by boiling point of 224 -224.5°C at 758 mmHg and 111 -112°C at 10 mmHg which was reported for Vi4-D4 in a secondary source to which no reliability could be assigned.

2,4,6,8,10-pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane Vi5-D5 (CAS No: 17704-22-2; impurity 1) and 2,4,6-trimethyl-2,4,6-trivinylcyclotrisiloxane Vi3-D3 (CAS no: 3901-77-7; impurity 2) may be present as impurities. The boiling points of the impurities have been predicted using a validated QSAR estimation method. Boiling points of approximately 270°C and 170°C were predicted for Vi5-D5 and Vi3-D3 respectively.