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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure (phenyl silsesquioxanes): 0.23 Pa at 20°C, 0.42 Pa at 25°C (EU Method A.4)

Vapour pressure (constituents of phenyl silsesquioxanes): 9.3E-23 to 0.096 Pa at 25°C (QSAR)

Key value for chemical safety assessment

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

Additional information

Measured vapour pressures of 0.23 Pa and 0.42 Pa at 20°C and 25°C respectively were determined for phenyl silsesquioxanes as a whole substance using the isothermal thermogravimetric effusion method in accordance with EU Method A.4 and in compliance with GLP. The result is considered to be reliable. Phenyl silsesquioxanes is a multiconstituent substance. Measured vapour pressure for the whole substance is preferred for the purpose of human health exposure assessment while for the purposes of environmental hazard and fate assessment; vapour pressures of the constituents have been predicted using a validated QSAR estimation method. Vapour pressures in the range 9.3E-23 Pa to 0.096 Pa were estimated for the constituents of phenyl silsesquioxanes.