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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Partition coefficient

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Administrative data

Link to relevant study record(s)

Description of key information

Log Kow:

Constituent 1 Vi5-D5: 9.0 at 20 - 25°C (QSAR)

Constituent 2 Vi4-D4: 6.47 at 20 - 25°C (OECD 117)

Key value for chemical safety assessment

Log Kow (Log Pow):

Additional information

2,4,6,8,10-Pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane Vi5-D5 (CAS No: 17704-22-2; Constituent 1) has a predicted log Kow value of 9.0, using a validated QSAR estimation method. A measured log Kow of 6.47 at 20 - 25°C was determined for 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane Vi4-D4 (CAS 2554-06-5; Constituent 2), using an appropriate test method (OECD TG 117). Although full details are not available, the result is considered to be reliable.