Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Adsorption / desorption

Currently viewing:

Administrative data

Link to relevant study record(s)

adsorption / desorption: screening
Type of information:
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
See attached QMRF/QPRF
Principles of method if other than guideline:
The result was obtained using an appropriate QSAR method (see attached QMRF and QPRF for details).
Key result
Sample No.:
log Koc
3.16 dimensionless
20 °C
A log Koc value of 3.16 was predicted for the substance using a validated QSAR method. The result is considered to be reliable.

Description of key information

Adsorption / desorption:

4,4,13,13-tetraethoxy-3,14-dioxa-8,9-dithia-4,13-disilahexadecane: log Koc 3.16 (QSAR)


(3-{[3-(trihydroxysilyl)propyl]disulfanyl}propyl)silanetriol: log Koc -2.58 (QSAR)

Key value for chemical safety assessment

Koc at 20 °C:
1 445

Additional information

A predicted log Koc value of 3.16 was determined for the substance using a validated QSAR estimation method.


4,4,13,13-Tetraethoxy-3,14-dioxa-8,9-dithia-4,13-disilahexadecane (S2) hydrolyses at a moderate rate (half-life 40 - 80 h at pH 7 and 20-25°C, predicted) in contact with water to form the silanol hydrolysis product and ethanol. The adsorption for the silanol hydrolysis product is predicted using the same QSAR calculation method as for the parent substance. The log Koc for silanol hydrolysis product, (3-{[3-(trihydroxysilyl)propyl]disulfanyl}propyl)silanetriol = -2.58.