Registration Dossier
Registration Dossier
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EC number: 200-901-0 | CAS number: 75-78-5
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
Dissociation constant [dichloro(dimethyl)silane]: Not Relevant
Dissociation constant (dimethylsilanediol): ca. 12.
Key value for chemical safety assessment
Additional information
The requirement to test the substance for dissociation constant is waived because in contact with water the substance hydrolyses very rapidly. The hydrolysis products in this case are dimethylsilanediol and hydrochloric acid. There are no reliable measured data for the dissociation constant of dimethylsilanediol. This suggests that silanols are not expected to undergo significant dissociation within the range of pH relevant in the environment or in vivo. Dimethylsilanediol is reported in a secondary source to have a first dissociation constant of 11.9. 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.
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