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EC number: 221-066-9
CAS number: 2996-92-1
Table 1: Percent degradation values
% degradation at sampling time (days)
0% in 28 d (OECD 310)
There are no reliable ready biodegradation data available for
trimethoxyphenylsilane. Therefore, good quality data for the analogue
substance, trichloro(phenyl)silane, have been read across. Both the
target and source substances are expected to hydrolyse within the
timescale of a ready biodegradation test and share the same silanol
hydrolysis product, phenylsilanetriol. The other, alcohol hydrolysis
products are methanol (target) and hydrochloric acid (source),
In the study on the source substance, 0% biodegradation was
observed in 28 days/60 days. The study was conducted according to OECD
guideline 310 and is considered reliable. This is selected as the key
study. The other hydrolysis product of the source substance,
hydrochloric acid, is inorganic and therefore biodegradation is not
relevant. The alcohol hydrolysis product of the target substance,
methanol, is readily biodegradable based on the results of standard
tests that show 76 – 82% and 95% removal in standard ready tests after 5
and 20 days, respectively.
Thus, there is no evidence of any significant biodegradation of the
silanol hydrolysis product phenylsilanetriol. For most organosilicon
compounds, little or no degradation is observed in ready biodegradation
studies once degradation of any readily biodegradable hydrolysis
by-product is accounted for.
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