Registration Dossier

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Endpoint:
biodegradation in water: sediment simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Endpoint:
biodegradation in water: simulation testing on ultimate degradation in surface water
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

Key value for chemical safety assessment

Additional information

The chemical safety assessment according to REACH Annex I indicates that it is not necessary to conduct the simulation test on ultimate degradation in surface water and the sediment simulation test, or to identify degradation products.

Simulation tests (water and sediments) are not considered necessary because:

- The substance is used under highly controlled conditions and, therefore, exposure of the aquatic environment is low (see Section 9 for further details).

- The substance and its intermediate hydrolysis products are unstable. The registered substance will hydrolyse rapidly in contact with water. The intermediate hydrolysis product is dimethylsilanol and the ultimate hydrolysis product is dimethylsilanediol. The risk characterisation ratios (RCRs) for the aquatic and sediment compartment, even with the conservative assumption that the silanol hydrolysis product is not biodegradable, are <1