Registration Dossier
Registration Dossier
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EC number: 200-877-1 | CAS number: 75-54-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
A biodegradation rate of 0% was determined in a reliable study conducted according to an appropriate test protocol (OECD 310), and in compliance with GLP.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
No data are available for the ready biodegradability of dichloro(methyl)silane. A ready biodegradability study is, however, available for the related substance trimethylsilanol. Trimethylsilanol is considered a close structural analogue of the hydrolysis product of dichloro(methyl)silane (methylsilanediol). It is considered appropriate to read across the ready biodegradability result for trimethylsilanol because the hydrolysis half-life of dichloro(methyl)silane (see section 5.1.2) indicates that, under conditions relevant to the ready biodegradation test, hydrolysis to methylsilanediol and HCL will occur. The properties of HCL are well characterised and further testing is not considered necessary. Biodegradation is not relevant, as HCL is inorganic.
The use of such read-across is supported by evidence that within a category of small molecule silicon-dominated organosilicon compounds, without reactive functional groups in the side chain, there is no evidence of any significant biodegradation in ready biodegradation tests (Data gap filling report for ready biodegradability of silicon-dominated substances PFA.151.004.022A.)
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