Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The registration substance is a UVCB substance containing many constituents. All of the constituents of the substance hydrolyse moderately to rapidly forming the corresponding silanol hydrolysis products and methanol. Further details on the hydrolysis reactions are attached in Section 13. Therefore, the environmental hazard assessment for aquatic, sewage treatment plant, sediment and soil are based on the parent constituents and/or hydrolysis products depending on the hydrolysis half-lives of the constituents in accordance with REACH guidance for Chemical Safety Assessment (Chapter R.16).


Methylsilanetriol (Silanol HP-X), (3-aminopropyl)silanetriol (Silanol HP-Z), disilyl(alkylamine)-heptol (Silanol HP-Y) and trisilyl(alkylamine)-undecol (Silanol HP-W) are the expected final products of hydrolysis reactions under conditions of a hydrolysis laboratory study and are the hydrolysis products relevant to conventional REACH Chemical Safety Assessment. However, other biotic or abiotic reactions may occur over longer time-scales in the environment.



ECHA (2016). REACH Guidance on Information Requirements and Chemical Safety Assessment Chapter R16: Environmental Exposure Assessment Version: 3.0. February 2016

Additional information