Registration Dossier
Registration Dossier
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EC number: 402-810-3 | CAS number: 17980-47-1 DYNASILAN BH N; DYNASILAN BSM 100 N; DYNASILAN NH 42
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vapour pressure (triethoxyisobutylsilane): 33 Pa at 20°C, 49 Pa at 25°C (dynamic method)
Vapour pressure (isobutylsilanetriol): 0.0029 Pa at 25°C (QSAR)
Key value for chemical safety assessment
- Vapour pressure:
- 33 Pa
- at the temperature of:
- 20 °C
Additional information
A measured vapour pressure values of 33 Pa and 49 Pa at 20°C and 25°C respectively were determined for the substance using an appropriate test method. The result is considered reliable and selected as key study. This value is supported by a predicted vapour pressure of 38 Pa at 25°C using a validated QSAR method. A secondary source to which no reliability could be assigned reported vapour pressure values of 120 Pa (20°C) and 173 Pa (25°C) for the substance, information on test method and purity of the sample was not stated. In a disregarded study, a vapour pressure value of 610 Pa at 25°C was determined for the substance. This study was disregarded due to very few temperature determinations over a very narrow range meaning that there was high uncertainty on the extrapolation. There are suspected typographical errors in the recorded raw data and due to inadequacies in the reporting, it is impossible to replicate the regression. Furthermore, it is noted that information on purity of the tested sample is lacking; this unexpectedly high result may possibly reflect impurities present, since the method used (static method) is susceptible to overestimate vapour pressure if volatile impurities are present in the sample. Differences in vapour pressure values could be as a result of varying purities for individual commercial samples tested, and method used.
The vapour pressure of the hydrolysis product was determined to be 0.0029 Pa at 25°C using an appropriate QSAR estimation method.
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