Registration Dossier
Registration Dossier
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EC number: 250-807-9 | CAS number: 31795-24-1
Endpoint summary
Administrative data
Description of key information
No in vivo or in vitro skin or eye irritation data are available. Based on the pH of the substance as supplied (pH >12), potassium methylsilanetriolate is expected to be highly corrosive and, in accordance with Column 2 of REACH Annexes VII and VIII, further testing is not required for skin and eye irritation.
Key value for chemical safety assessment
Skin irritation / corrosion
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (corrosive)
Eye irritation
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irritating)
Additional information
No skin and eye irritation/corrosion data are available for potassium methylsilanetriolate.
Potassium methylsilanetriolate is a mono-constituent ionic substance of 35-55% w/w potassium methylsilanetriolate in aqueous solution that has a very alkaline pH of >12. Potassium methylsilanetriolate dissociates complete into potassium and methylsilanetriolate ions in aqueous solution. In more dilute aqueous solution the pH of the substance will be reduced dependent on concentration. As the pH is reduced, the concentration of the non-ionised form of methylsilanetriolate (methylsilanetriol) increases. At pH < 9.0, the substance is no longer in the ionised form; methylsilanetriol is the predominant species at low concentrations, with dimers and oligomers of methylsilanetriol forming at higher concentrations.
Potassium hydroxide is classified in Annex VI of Regulation (EC) No. 1272/2008 as R35 "Corrosive" and "Skin Corr. 1A" and has specific concentration limits that indicate that potassium methylsilanetriolate should also be classified as corrosive.
Justification for selection of skin irritation / corrosion endpoint:
In accordance with Column 2 of REACH Annex VIII, the in vivo skin irritation study (required in Section 8.1.1) does not need to be conducted as the available information indicates that the substance meets the criteria for classification as corrosive.
Justification for selection of eye irritation endpoint:
In accordance with Column 2 of REACH Annex VIII, the in vivo eye irritation study (required in Section 8.2.1) does not need to be conducted as the substance is classified as corrosive.
Effects on skin irritation/corrosion: corrosive
Effects on eye irritation: corrosive
Effects on respiratory irritation: highly irritating
Justification for classification or non-classification
Based on the pH and composition of the substance as supplied, potassium methylsilanetriolate is classified as "Skin. Corr. 1A" according to Regulation (EC) No. 1272/2008.
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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