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EC number: 239-311-3
CAS number: 15267-95-5
Biodegradation in water, screening tests:
30-34 % in 28 days (OECD 301F)
There are no reliable ready biodegradation
data available for (chloromethyl)triethoxysilane (CAS No. 15267-95-5),
therefore good quality data for the structurally-related substance,
Silane, (chloromethyl)dimethoxymethyl- (CAS No. 2212-11-5), have been
read across. Both substances hydrolyse to structurally-related silanol
hydrolysis products, (chloromethyl)silanetriol and
(chloromethyl)methylsilanediol, the other hydrolysis products being
methanol and ethanol, respectively, which are readily biodegradable
(OECD, 2004a and b).
Both chloromethyl)triethoxysilane (CAS No.
15267-95-5) and silane, (chloromethyl)dimethoxymethyl- (CAS No.
2212-11-5) are within a wider analogue group, than the analogue group
discussed in Section 1.4. Substances within this wider analogue group,
in general, exhibit no evidence of any significant biodegradation once
hydrolysis and subsequent biodegradation of alkoxy/acetoxy groups has
been taken into account.
This wider analogue group for the ready
biodegradability endpoint consists of a number of sub-classes of
substances. However, read-across is carried out between substances with
the same sub-class in most cases.
biodegradation data within the analogue group (III-15) of chlorosilanes,
siloxanes, silanes and alkoxysilanes etc, with chloroalkyl functional
group(s) in side chain after any very rapid hydrolysis has been
chloromethyl)triethoxysilane (CAS No. 15267-95-5) and
silane,(chloromethyl)dimethoxymethyl- (CAS No. 2212-11-5) are members of
It is therefore considered valid to
read-across the results for silane,(chloromethyl)dimethoxymethyl- to
fill the data gap for the registered substance. Additional information
is given in a supporting report (PFA, 2013f) attached in Section 13 of
the IUCLID dossier.
Table 4.1.4: Ready biodegradation
data available for substances within the relevant sub-class (III-15) of
Readily biodegradable? Yes/no
Result: Biodegradation after 28 day
Corrected % biodegradation once alkoxy/acetoxy biodegradation is accounted for
OECD 301 B
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
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