Registration Dossier
Registration Dossier
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EC number: 281-161-6 | CAS number: 83877-91-2
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Substance decomposes during vapour pressure testing (OECD 104). Because of rapid hydrolysis, vapour pressure of 2-methylpropanol released from the substance is used in CSA.
Key value for chemical safety assessment
- Vapour pressure:
- 10 hPa
- at the temperature of:
- 20.9 °C
Additional information
The isothermal TGA effusion method by using OECD 104 in accordance with GLP was applied for the determination of the vapour pressure of the substance. The vapour pressure could not be determined as the test substance decomposes during testing.
Test substance is hydrolytically unstable (half-life <10 minutes; OECD 111). When it comes in contact with water or moisture a complete hydrolysis will take place with no significant reaction products other than 2 -methylpropanol and ethyl acetoacetate and insoluble hydrated titanium oxides.
Because of rapid hydrolysis, the CSA concentrates on the most hazardous degradation product which is 2 -methylpropanol. Read-across data of the vapour pressure for the most hazardous substance 2-methylpropanol released from the substance is used as a key value in CSA (peer-reviewed secondary source, Lide 2008).
The other degradation products ethyl acetoacetate and hydrated titanium dioxide are not further considered in the chemical safety assessment as they are non-hazardous to human health.
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