Registration Dossier

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Key value for chemical safety assessment

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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 risk characterisation ratios (RCRs) for the aquatic and sediment compartment, even with the realistic assumption that the parent substance is not biodegradable, are <1.

The registration substance has an average purity of >80% Vi4-D4, with <15% 2,4,6,8,10-pentamethyl-2,4,6,8,10-pentavinylcyclopentasiloxane (Vi5-D5; CAS 17704-22-2; Impurity 1) and <10% 2,4,6-trimethyl-2,4,6-trivinylcyclotrisiloxane (Vi3-D3; CAS 3901-77-7; Impurity 2) present as impurities. The data waiver applies for both the main constituent and the impurities.Additional information is given in a supporting report (PFA, 2017) attached in Section 13 of the IUCLID 6 dossier.