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EC number: 239-311-3
CAS number: 15267-95-5
The results of each determination are shown in the following table:
Nominal test pH
Aqueous Phase pH
Partition coefficient (P’ow)
Dissociation constant (pKa)
* The results at pH 8 were excluded from the determination of the final
pKa mean and range on the basis that the accuracy of the estimation
method decreased as the distance between the dissociation constant and
the aqueous phase pH increased, pH 8.0 being >1.5 units from the final
estimation value. This is consistent with the approach used in the
titration method in OECD method 112.
Dissociation constant: (chloromethyl)triethoxysilane) not relevant
Dissociation constant (silanol hydrolysis product): approximately 10,
based on read-across from phenylsilanetriol
The requirement to test the substance for dissociation constant is
waived because in contact with water the substance rapidly hydrolyses to
form chloromethylsilanetriol and ethanol. There are no reliable measured
data for the dissociation constant of chloromethylsilanetriol. The
typical dissociation constants for the hydroxyl protons of silanetriols
are available from studies in other silanetriols. It is appropriate to
read-across dissociation constant data for chloromethylsilanetriol from
phenylsilanetriol. This suggests that silanols are not expected to
undergo significant dissociation within the range of pH relevant in the
environment or in vivo. Phenylsilanetriol has a measured first
dissociation constant approximately 10 in a reliable study using a
relevant test method, (reliability 1; read-across conclusion is given
reliability 2). 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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