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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Administrative data

Link to relevant study record(s)

Description of key information

Viscosity [octamethylcyclotetrasiloxane]: 1.6 mm2/s at 20°C (QSAR)

Key value for chemical safety assessment

1.6 mm²/s (static)
at the temperature of:
20 °C

Additional information

There is no reliable measured viscosity value for the substance. A predicted kinematic viscosity of 1.6 mm2/s at 20°C was determined for the substance using a validated QSAR estimation method. The result is considered to be reliable and selected as key study. This value is supported by kinematic viscosity values of 2.3 - 2.6 mm2/s at 20 - 25°C which were reported for the substance in secondary sources to which reliability could not be assigned.