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EC number: 201-251-0
CAS number: 80-10-4
Dissociation constant (substance): Not relevant
Dissociation constant (silanol hydrolysis product): approximately 10-12,
based on read-across from phenylsilanetriol and dimethylsilanediol.
The requirement to test the
substance for dissociation constant is waived because in contact with
water the substance rapidly hydrolyses to form diphenylsilanediol and
There are no reliable measured
data for the dissociation constant of diphenylsilanediol. The typical
dissociation constants for the hydroxyl protons of silanediols are
available from other silanediols. It is appropriate to read-across
dissociation constant data for diphenylsilanediol from
dimethylsilanediol. Dimethylsilanediol has a measured first dissociation
constant of approximately 11.9 reported in secondary literature.
It is also appropriate to
read-across dissociation constant data from phenylsilanetriol
to diphenylsilanediol. Phenylsilanetriol
has a measured first dissociation constant of approximately 10 reported
in a reliable study using a relevant test method, (reliability 1;
read-across conclusion is given reliability 2).
studies suggest that silanols are not expected to undergo significant
dissociation within the range of pH relevant in the environment or in
vivo. Additional information is given in a supporting report
(PFA, 2013b) attached in Section 13 of the REACH technical dossier.
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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