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EC number: -
CAS number: -
The UVCB substance 400160 consists of diester, monoester, and the diacid component. Out of these three components only the diacid and monoester are able to dissociate. The pKa of the diacid component is comparable to those of other long-chain fatty acids, e.g. oleic acid (calculated pKa 4.74 - SPARC On Line-Calculator, pKa 5.02 - literature value).
400160 is a surface active UVCB substance.
For complex mixtures (e.g. UVCBs) containing ionisable components the
assessment of pKa is technically challenging. The analytical method is
not sensitive enough. As the
analytical effort and costs to measure the dissociation constant of
400160 are not justified a weight of evidence approach was used instead
of testing. Therefore the estimation of the ionisable component was
The dissociation constant of the diacid
component is similar to those of other long-chain fatty acids, e.g.
oleic acid (pKa = 4.74 calculated for oleic acid using SPARC On-Line
Calculator; pKa = 5.02 in aqueous solution at 25°C – literature value).
The compounds of 400160 which are able to
dissociate have a pKa of around 5. Therefore the predicted pKa value
matches the lower level of the environmental relevant pH margin (pH 5
-9). It is not expected that the predicted pKa value significantly
differs from that value that could be obtained by testing.
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.
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