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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Biodegradation in water and sediment: simulation tests

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Administrative data

Link to relevant study record(s)

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Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Data waiving:
study technically not feasible
Justification for data waiving:
other:
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
In accordance with section 2 of REACH Annex XI, testing is technically not possible because the substance is hydrolytically unstable. The test item undergoes rapid hydrolysis (half-life < 1h) in aqueous to 2-butanone oxime and the corresponding methylsilanetriol. Moreover, silanetriols undergo continuous condensation reactions to produce higher molecular weight siloxanes which are considered biologically unavailable.
Reason / purpose for cross-reference:
data waiving: supporting information
Transformation products:
yes
No.:
#1
No.:
#2
Endpoint:
biodegradation in water: sediment simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
In accordance with column 1 of REACH Annex IX, the sediment simulation test study does not need to be conducted as the substance and degradation products have no adsorption potential expected to sediment (Log Kow <3).
Reason / purpose for cross-reference:
data waiving: supporting information
Transformation products:
yes
No.:
#1
No.:
#2

Description of key information

Data waiving: In accordance with section 2 of REACH Annex XI, the simulation test study on water is technically not possible because the substance is hydrolytically unstable. The test item undergoes rapid hydrolysis (half-life < 1h) in aqueous to 2-butanone oxime and the corresponding methylsilanetriol. Moreover, silanetriols undergo continuous condensation reactions to produce higher molecular weight siloxanes which are considered biologically unavailable.


Data waiving: In accordance with column 1 of REACH Annex IX,  the sediment simulation test study does not need to be conducted as the substance and degradation products have no adsorption potential expected to sediment.

Key value for chemical safety assessment

Additional information