Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Half-life for silicon containing constituents: <12 hours at 25°C and pH 4, pH 7 and pH 9
Key value for chemical safety assessment
Additional information
Hydrolysis is not a required endpoint at Annex VII. All silicon-containing constituents of the substances are known to hydrolyse rapidly:
- Acetoxy groups hydrolyse very rapidly (half-life <1 min at pH 4, 7 and 9) to give a silanol (Si-OH) group.
- Methoxy groups hydrolyse rapidly (half-life minutes - a few hours at pH 4, 7 and 9) to give a silanol (Si-OH) group.
- Siloxane groups (Si-O-Si) in the acetoxy/methoxy disiloxane constituents will hydrolyse rapidly, after the acetoxy/methoxy groups, to form monomeric silanols.
All silicon-containing constituents have predicted half-lives of <12 hours at 20 - 25°C and pH 4, pH 7 and pH 9. The ultimate hydrolysis products of all silicon containing constituents are vinylsilanetriol and 3-(2,3-epoxypropoxy)propyl]silanetriol.
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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