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The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2/Chesar 3.4), see table below. Due to the rapid hydrolysis of the registered substance, the distribution calculation is done for the hydrolysis products, [3-(2,3-epoxypropoxy)propyl]silanetriol and methanol.

Table: Distribution modelling for STP






Release directed to water




Release directed to air 




Release directed to sludge 




Release degraded 




[3-(2,3-Epoxypropoxy)propyl]silanetriol is not expected to undergo any significant biodegradation and is predicted to have low Henry’s Law constant and low log Kow/log Koc. Distribution modelling for STP indicates that water is the main compartment to which it is expected to partition in a sewage treatment plant. Water is also likely to be the main compartment to which [3-(2,3-epoxypropoxy)propyl]silanetriol will partition in the wider environment.