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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Water solubility

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Description of key information

Water solubility [1,1,1,3,5,5,5-heptamethyl-3-[(trimethylsilyl)oxy]trisiloxane]: 0.00189 mg/l at 23°C

Key value for chemical safety assessment

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

Additional information

Two reliable measured data are available for the water solubility of the substance. A measured water solubility value of 0.36 mg/l (3.64E-04 g/l) at 20±0.5°C and pH 6.2 was determined for the substance in accordance with OECD 105 and in compliance with GLP. Similarly, a water solubility of 1.89± 0.02 ppb (0.00189 mg/l) was determined at 23°C in a reliable study conducted according to generally accepted scientific principles. There is agreement between the two data and the results are used as weight of evidence. However, the water solubility of 0.00189 mg/l at 23°C will be used for assessment purpose, since the other measured result is a limit value.