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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Short-term toxicity to aquatic invertebrates

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Administrative data

Link to relevant study record(s)

Description of key information

A 48-hour EC50 of > 500 mg/l, OECD 202, RL2

Key value for chemical safety assessment

Additional information

No data is available for trichloro(chloromethyl)silane (CAS No. 1558 -25. However, due to fast hydrolysis read across to the hydrolysis product (chloromethyl)trisilanol is warranted accoring to ECHA guidance that states that “for substances where hydrolytic DT50is less than 12 hours, environmental effects are likely to be attributed to the hydrolysis product rather than to the parent itself." Hydrochloric acid is not classified for environmental hazards. Data relevant for the assessment of the other hydrolysis product (chloromethyl)trisilanol can be taken from a tests with triethoxy(methyl)silane (CAS No. 2031-67-6) which has a hydrolysis half-life of approximately 5.5 h at 20-25°C and pH 7 and thus predominatly gives information on a similar silanol hydrolysis product (see table below).

hydrolysis product

(chloromethyl)silanetriol

(methyl)silanetriol

Molecular weight

128.59

94.14

log Kow

-2.1

-2.4

Water sol

1 000 000 mg/l at 20°C

1 000 000 mg/l at 20°C

Vapour pressure

2.1E-03 Pa at 25°C (QSAR)

0.052 Pa at 25°C

Hydrolysis t1/2at pH 7 and 20°C-25°C

2.5 h

5.5 h

Hydrolysis t1/2at pH 4 and 25°C

0.2 h

0.3 h

Hydrolysis t1/2at pH 9 and 25°C

0.1 h

0.1 h

Short-term toxicity to fish (LC50)

>100 mg/l

>500 mg/l

Algal inhibition (ErC50and NOEC)

>100 mg/l

>500 mg/l
The other hydrolysis product (ethanol) is not classified for environmental hazards and thus not relevant for the assessment. A 48-hour EC50value of >500 mg/l and NOEC of ≥500 mg/l have been determined for the effects of triethoxy(methyl)silane (CAS No. 2031-67-6)on mobility ofDaphnia magna based on nominal concentration of the substance. The study was conducted according to a standard guideline (EU Method C.2 (Acute Toxicity forDaphnia) and GLP and was selected as key study (Hazleton, 1994).