Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 939-487-8 | CAS number: -
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Water solubility (constituent 1 of phenyl silsesquioxanes): 6.6 μg/L at 23°C (measured)
Water solubility (constituents of phenyl silsesquioxanes): 4.9E-05 to 4.94E-51 mg/l at 20°C (QSAR)
Key value for chemical safety assessment
- Water solubility:
- 6.6 µg/L
- at the temperature of:
- 23 °C
Additional information
The determination of the solubility in water of phenyl silsesquioxanes as a whole substance is not scientifically meaningful for the purpose of assessment of exposure or risk. Phenyl silsesquioxanes is a multiconstituent substance; exposure assessment is best achieved by considering the water solubility of the individual constituents.
A water solubility value of 6.6 ± 0.43 ppb at 23 °C was determined for PhM3T (CAS 2116-84-9), the monomer constituent (Constituent 1) of the registration substance, in a reliable study conducted according to generally accepted scientific principles.
The water solubilities of all constituents have been determined using a QSAR estimation method. Water solubility values in the range 4.9E-05 to 4.94E-51 mg/l at 20°C were estimated for the constituents of the substance. Linear constituents 2 -7, and cyclic constituents 3 -7 fall outside of the applicability domain of the QSAR, however the estimation serves to indicate the very low water solubility of these constituents.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
