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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure: <1E-06 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

The registration substance, octaphenylcyclotetrasiloxane is a solid with a melting temperature of >200°C and predicted boiling point of >700°C at standard atmospheric pressure. A predicted vapour pressure of 7.4E-15 Pa at 25°C was determined for the substance, however, this predicted result is outside the lower end of the descriptor range. According to the ECHA Guidance R7.a (version 6.0, July 2017); if the melting point is between 200 -300°C, a limit value for the vapour pressure is sufficient. Therefore, the vapour pressure of the submission substance is reported as <1E-06 Pa at 25°C. The predicted result is considered to be reliable and sufficient for assessment purposes.