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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 942-403-2 | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The partition coefficient, log POW, of MEXORYL SCK was calculated from the individual solubilities in n-octanol and in water, respectively, to be:
log POW = log10 [(<71.97 mg / L) / (>531866.13 mg / L) ] < -3.87 at 21.5°C
The pH in the aqueous phase was determined to be 5.7.
The substance has LOW potential for bioaccumulation (log Kow<4).
Key value for chemical safety assessment
Additional information
One GLP study was performed in order to determine the partition coefficient of MEXORYL SCK (also called MEXORYL SBT).
First of all, based on a preliminary test, a good solubility in water and a very poor solubility in n-octanol were found indicating a partition coefficient below -2. Then, neither the HPLC-method according to OECD Guideline No. 117 nor the flask-shaking method according to OECD Guideline No. 107 were applicable for the determination of the partition coefficient of the surface active substance, the MEXORYL SCK.
For these reasons, the log POWvalue for the test item was estimated from its solubility in n-octanol and in water, respectively to be:
log POW = log10 [(<71.97 mg / L) / (>531866.13 mg / L) ] <-3.87 at 21.5°C
The pH in the aqueous phase was determined to be 5.7.
This estimation method is acceptable but considered as reliable with restrictions due to the lack of information . In particular, we have no information on the time of equilibration for the determination of the solubility in octanol ( we don't know if 24h is sufficient to reach equilibration.) and no information on the influence of the loading rate in the determination of the solubility in n-octanol and in water. In addition the method used allows only to determine an estimation of the log Kow without taking into account the interaction between the solvents.
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.
