Registration Dossier
Registration Dossier
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EC number: 221-906-4 | CAS number: 3277-26-7
Endpoint summary
Administrative data
Description of key information
Additional information
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat 3.0 model (implemented in EUSES), see table below. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for the silanol hydrolysis product
Table. Distribution modelling for STP
Assessment entities |
dimethylsilanol (Intermediate HP) |
dimethylsilanediol (final HP) |
Release to water |
97.13% |
99.98% |
Release to air |
2.598% |
6.15E-4% |
Release to sludge |
0.266% |
9.89E-3% |
Release degraded |
0% |
0% |
Summary
1,1,3,3-Tetramethyldisiloxane hydrolyses very rapidly (half-life 11.3 minutes at pH 7 and 25°C) to form dimethylsilanol, which further hydrolyses to form the final hydrolysis product, dimethylsilanediol (half-life 2.5 days). Dimethylsilanediol is not expected to undergo any significant biodegradation, has low Henry’s Law constant and low log Kow/log Koc. Therefore water is the main compartment to which it is expected to partition in a sewage treatment plant.
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