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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Toxicity to terrestrial plants

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
toxicity to terrestrial plants: long-term
Data waiving:
exposure considerations
Justification for data waiving:
other:

Description of key information

In accordance with REACH Annex XI, Section 3, exposure of terrestrial organisms to dimethoxydimethylsilane is not significant (RCR << 1) and the substance has a low hazard potential based on the available acute and chronic data.

Key value for chemical safety assessment

Additional information

In accordance with Annex XI, Section 3, exposure of terrestrial organisms to triethoxy(vinyl)silane is not significant.

The hazard assessment based on acute and chronic aquatic toxicity data shows no or only moderate toxicity toward aquatic organisms of all three trophic levels (all acute effect values, i.e. E(L)C50s were > 100 mg/L; 21-day NOEC in daphnia = 28.1 mg/L; 72 -h NOErC ≥ 89 mg/L in algae). The substance is well soluble and thus, greater toxicity in long-term tests is unlikely.

Even though no hazard was identified in acute aquatic studies and only a moderate hazard was identified in the chronic aquatic invertebrate study, PNECs aqua were derived for the purpose of risk characterization, using the 21-day NOEC value of 28.1 mg/L (equivalent to 20 mg/L vinylsilanetriol) derived from the daphnia study in combination with standard safety factors as outlined in ECHA guidance R.10. A PNEC soil was calculated based on the equilibrium partitioning method. As the substance hydrolyses rapidly, the environmental hazard assessment, PNEC derivation and risk characterization is based on the silanol hydrolysis product following a worst case approach. The other hydrolysis product, ethanol, is known for its absence of environmental toxicity (OECD SIDS, 2004). The risk characterization for the silanol hydrolysis product indicated no risk to the terrestrial environment (RCR < < 1).

For detailed information on the risk assessment please see the attached documentation in chapter 13 (CSR).

 

References:

OECD SIDS, 2004. Ethanol - SIDS Initial Assessment Report For SIAM 19, Berlin, Germany: UNEP Publications.