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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Reliable short-term toxicity tests results are available for freshwater fish (Oryzias latipes), invertebrates (Daphnia magna) and algae (Pseudokirchneriella subcapitata) for the silanol hydrolysis product of the registered substance, tert-butyldimethylsilanol (CAS No. 18173-64-3). The relevant short-term values are:

Fish: LL50 (96 h) > 100 mg/l (nominal).

Daphnia: EC50 (48 h): 6.49 mg/l; (nominal).

Algae: ErC50 (72 h): 84.0 mg/l; NOEC 12.5 mg/l (nominal).

The registrant does not hold data for the non-silanol hydrolysis product, piperazine (CAS No. 110-85-0). However, aquatic data were reported in the SIAR (SIDS INITIAL ASSESSMENT PROFILE for Piperazine, CAS 110-85-0, SIAM 18, 20-23 April 2004). The data shows that Daphnia are the most sensitive species to both hydrolysis products of the registration substance, with the silanol hydrolysis product, tert-butyldimethylsilanol, showing higher toxicity than piperazine. Because the substance will only be used under Strictly Controlled Conditions (SCC) the measured data are not used for the purpose of setting PNECs. However, they are used for classification and labelling purposes.