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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Description of key information

No biodegradation expected for trichloro(chloromethyl)silane (CAS No. 1558 -25-4).

Key value for chemical safety assessment

Additional information

No data is available for trichloro(chloromethyl)silane (CAS No. 1558 -25 -4). Trichloro(chloromethyl)silane hydrolysis results in chloromethylsilantriol and hydrochloric acid which is inorganic and will not be discussed. Silane, (chloromethyl)dimethoxymethyl- (CAS No. 2212-11-5) hydrolyses to the structurally-related silanol hydrolysis products (chloromethyl)methylsilanediol. The other hydrolysis products being methanol and ethanol, respectively, which are readily biodegradable. It is therefore considered valid to read-across the results for silane,(chloromethyl) dimethoxymethyl- to fill the data gap for the registered substance and ignoring for the conclusion the contribution of methanol to the biodegradation

In the study 30–34 % biodegradation was observed in 28 days. The study was conducted according to OECD guideline 301F and is considered reliable (IBACON, 2002). This is selected as the key study. The study is considered to be reliability 1 (reliable without restrictions).

Taking into account the contribution of methanol to the biodegradation no biodegradation can be expected fortrichloro(chloromethyl)silane (CAS No. 1558 -25).

This is further supported by the following overview on the wider group of chloralkylsilanes.

CAS

Name

Readily biodegradable? Yes/no

Result: Biodegradation after 28 day

Guideline

Reliability

Corrected % biodegradation once alkoxy/acetoxy biodegradation is accounted for

002212-11-5

Silane, (chloromethyl)dimethoxymethyl-

No

30-34%

OECD 301F

1a

-16

007787-93-1

Dichloro(3-chloropropyl)methylsilane

No

0%

EC C4-C

1a

0

013501-76-3

(3-chloropropyl)diethoxymethylsilane

No

56%

EC C4-A

1a

6

002530-87-2

3-chloropropyltrimethoxysilane

No

43%

OECD 301 B

1

-7

005089-70-3

(3-chloropropyl)triethoxysilane

No

46%

EC C4-C

1a

-21

002344-80-1

Chloromethyltrimethylsilane

No

6%

OECD 301D

1a

6