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Water solubility

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water solubility
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
Equilibration by slow-stirring (pure liquid substance in contact with distilled water).
GLP compliance:
Type of method:
other: Equilibration by slow-stirring
Water solubility:
0.056 mg/L
23 °C
ca. 7
Details on results:
Stable: no
Degradation products: yes
Degradation products (CAS No./EC No./EINECS Name): 1066-42-8 213-915-7 dimethylsilanediol

Water solubility = 56.2 ug L-1  (190 x 10-9 mol L-1) at 23 °C

Interpretation of results: insoluble (< 0.1 mg/L)
A water solubility value of 0.0562 mg/L was determined at 23°C in a reliable study conducted according to generally accepted scientific principles.

Description of key information

Water solubility [octamethylcyclotetrasiloxane]: 0.056 mg/l at 23°C

Key value for chemical safety assessment

Water solubility:
0.056 mg/L
at the temperature of:
23 °C

Additional information

Two reliable measured values for the solubility of the registration substance in freshwater are available. A water solubility value of 0.056 mg/l at 23°C was determined for the substance using equilibration by the slow-stirring method. The result is considered to be reliable and is selected as key study. This value is supported by a measure water solubility of 0.07 mg/l at 25°C using a relevant test method. The key study was selected as it is the most recent study and is in line with the UK RAR. In a secondary source to which reliability could not be assigned, a water solubility of 0.02 mg/l at 25°C was reported for the substance.

In synthetic seawater, the substance has a measured solubility of 0.033 mg/l at 25°C.