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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Abiotic degradation:


3-Chloropropyl(dimethoxy)methylsilane hydrolyses rapidly (0.1 h at pH 4, 1.3 h at pH 7 and 0.03 h at pH 9 and 20-25°C) under relevant environmental conditions to form 3-chloropropyl(methyl)silanediol and methanol. Reactions with water vapour rather than photolysis is likely to be the primary degradation process in air.


 


Biotic degradation:


A biodegradation in water study has been read across from a relevant analogous substance. The result indicates that no significant biodegradation in water of the hydrolysis product, 3-chloropropyl(methyl)silanediol, is expected. The chemical safety assessment indicates that it is not necessary to obtain further information on biodegradation via simulation tests in water, sediment or soil.

Additional information

Table: Degradation rates






















Degradation rate in water:



Hydrolysis half-life: 1.3 hours at pH 7 and 20-25°C, for removal of parent (predicted). No significant biodegradation of silanol hydrolysis product expected.



Degradation rate in sediment:



No significant biodegradation of silanol hydrolysis product expected.



Degradation rate in soil:



No significant biodegradation of silanol hydrolysis product expected.



Degradation rate in air:



Half-life for reaction with hydroxyl radicals in air: 4.1 days for parent; 1.8 days for silanol hydrolysis product (predicted).