Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Reliable short-term toxicity tests results are available for freshwater fish (Oncorhynchus mykiss), invertebrates (Daphnia magna) and algae (Pseudokirchneriella subcapitata) for the registered substance trimethoxy(vinyl)silane (CAS 2768-02-7). The relevant short-term values are:

Fish: LC50 (96 h): 137 mg/L expressed in terms of concentration of the hydrolysis product, vinylsilanetriol.

Daphnia: EC50 (48 h): 121 mg/L expressed in terms of concentration of the hydrolysis product, vinylsilanetriol.

Algae: EC50 (72 h): >64 mg/L; NOEC: =64 mg/L expressed in terms of concentration of the hydrolysis product, vinylsilanetriol.

Long-term data are available with invertebrates (Daphnia magna):

21-day NOEC: 20 mg/L expressed in terms of concentration of the hydrolysis product, vinylsilanetriol.

 

The very rapid hydrolysis of trimethoxy(vinyl)silane (CAS 2768-02-7) (half-life 0.1 h at pH 7 and 20-25°C) means it is likely that the test organisms in each test were exposed primarily to the hydrolysis products, vinylsilanetriol and methanol.

 

There are no reliable microorganism toxicity data available for trimethoxy(vinyl)silane (CAS 2768-02-7), therefore good quality data for the structurally-related substance, trichloro(vinyl)silane (CAS 75-94-5), have been read across. Both substances share the same silanol hydrolysis product, vinylsilanetriol. The other hydrolysis products are methanol and hydrogen chloride / chloride salts respectively.

 

Refer to IUCLID Section 6 endpoint summary (CSR Section 7.0) for further discussion of the approach to chemical safety assessment and justification for read-across.