Registration Dossier
Registration Dossier
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EC number: 445-890-5 | CAS number: 201290-01-9
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vapour pressure [N,N-bis(trimethylsilyl)aminopropylmethyldiethoxysilane]: 0.486 Pa at 25°C (OECD 104)
Vapour pressure [3-(diethoxymethylsilyl)propylamine]: 7 Pa at 25°C (QSAR)
Vapour pressure [3-(dihydroxymethylsilyl)propylamine]: 2.2E-02 Pa at 25°C (QSAR)
Vapour pressure [trimethylsilanol]: 1400 Pa at 25°C (QSAR)
Vapour pressure [ethanol]: 7910 Pa at 25°C
Key value for chemical safety assessment
- Vapour pressure:
- 0.486 Pa
- at the temperature of:
- 25 °C
Additional information
A measured vapour pressure value of 0.486 Pa at 25°C was determined for the substance using a vapour pressure balance in accordance with OECD Test Guideline 104 and in compliance with GLP. The result is considered to be reliable and is selected as the key study.
In contact with water, the substance hydrolyses very rapidly to form 3-(diethoxymethylsilyl)propylamine as an intermediate hydrolysis product and trimethylsilanol. The intermediate hydrolysis product, 3-(diethoxymethylsilyl)propylamine undergoes further hydrolysis to form 3-(dihydroxymethylsilyl)propylamine and ethanol.
The vapour pressure of the intermediate hydrolysis product, 3-(diethoxymethylsilyl)propylamine has been predicted to be 7 Pa at 25°C using a validated QSAR estimation method.
3-(Dihydroxymethylsilyl)propylamine and trimethylsilanol have predicted vapour pressure values of 2.2E-02 Pa at 25°C and 1400 Pa at 25°C respectively using a validated QSAR estimation method.
Ethanol has a reported vapour pressure of 7910 Pa at 25°C ((Daubert, T E and Danner R P (1985)).
Reference:
Daubert, T E and Danner R P (1985). Physical and Thermodynamic properties of Pure Chemicals. Data Compilation
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