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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Reference
Endpoint:
partition coefficient
Data waiving:
study technically not feasible
Justification for data waiving:
the study does not need to be conducted because the substance decomposes

Description of key information

Log Kow [1-methyl-N,N',N''-tris(1-methylpropyl)silanetriamine]: not relevant

Log Kow [methylsilanetriol]: -2.4 at 20°C (QSAR)

Log Kow [sec -butylamine]: 0.74

Key value for chemical safety assessment

Additional information

The requirement to conduct an n-octanol/water partition coefficient for the registered substance is waived because in contact with water the substance hydrolyses very rapidly to form methylsilanetriol (CAS No. 2445-53-6) and sec-butylamine (CAS No. 13952-84-6).

The log Kow of the silanol hydrolysis product, methylsilanetriol has been predicted to be -2.4 at 20°C using a validated QSAR estimation method.

A partition coefficient value of 0.74 was reported for sec-butylamine (Hansch et al 1995).

Reference:

Hansch, C., Leo, A., D. Hoekman (1995). Exploring QSAR - Hydrophobic, Electronic, and Steric Constants. Washington, DC: American Chemical Society., 1995., p. 10