Registration Dossier
Registration Dossier
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EC number: 273-054-8 | CAS number: 68937-17-7
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Water Solubility: 3100 mg/l at 20°C (1,2-dihydroxy-1,1,2,2-tetramethyldisilane)
Water Solubility: 380 000 mg/l at 20°C (1,1,2-trihydroxy-1,2,2-trimethyldisilane)
Water Solubility: 1 000 000 mg/l at 20°C (1,1,2,2-tetrahydroxy-1,2-dimethyldisilane)
Water Solubility: 1 000 000 mg/l at 25°C (dimethylsilanediol)
Water Solubility: 1 000 000 mg/l at 20°C (methylsilanetriol)
Key value for chemical safety assessment
Additional information
In accordance with Column 2 of REACH Annex VII, the water solubility study (required in Section 7.7) does not need to be conducted as the substance has a hydrolytic half-life less than 12 hours at pH 4, 7 and 9.
Each chlorosilane constituent of the substance hydrolyses very rapidly in contact with water to give the corresponding silanol. The water solubility of each hydrolysis product has been calculated using a validated QSAR, although methylsilanetriol and dimethylsilanediol would soon also be formed and these substances are also highly water soluble.
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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