Registration Dossier
Registration Dossier
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EC number: 213-603-0 | CAS number: 993-07-7
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 2005-04-11
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- The study was conducted according to relevant test Methods and in compliance with GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- not specified
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- not specified
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- dynamic method
- Temp.:
- 20 °C
- Vapour pressure:
- 12.9 hPa
- Temp.:
- 25 °C
- Vapour pressure:
- 19 hPa
- Transition / decomposition:
- no
- Conclusions:
- Vapour pressure values of 12.9 hPa and 19 hPa at 20°C and 25°C respectively were determined for the substance using relevant test method and in compliance with GLP. The result is considered to be reliable..
Referenceopen allclose all
Raw data
Data point |
Boiling temperature T [°C] |
Vapour pressure ƿ [hPa] |
1 |
7 |
4.2 |
2 |
19 |
12 |
3 |
30 |
30 |
4 |
49 |
102 |
5 |
65 |
263 |
6 |
61 |
202 |
7 |
56 |
156 |
8 |
43 |
71 |
9 |
25 |
19 |
10 |
14 |
8 |
Conversion of raw data
Data point |
T [K] |
1/T [1/K] |
log ƿ [hPa] |
1 |
280.15 |
0.003570 |
0.62325 |
2 |
292.15 |
0.003423 |
1.07918 |
3 |
303.15 |
0.003299 |
1.47712 |
4 |
322.15 |
0.003104 |
2.00860 |
5 |
338.15 |
0.002957 |
2.41996 |
6 |
334.15 |
0.002993 |
2.30535 |
7 |
329.15 |
0.003038 |
2.19312 |
8 |
316.15 |
0.003163 |
1.85126 |
9 |
298.15 |
0.003354 |
1.27875 |
10 |
287.15 |
0.003483 |
0.90309 |
Formula of regression: log ƿ [hPa] = -2905.76 * 1/T [1/K] +11.02367
Description of key information
Vapour pressure [trimethylsilane]: >100 000 Pa at 20°C
Vapour pressure [trimethylsilanol]: 1290 Pa at 20°C and 1900 Pa at 25°C (OECD 104)
Key value for chemical safety assessment
Additional information
Trimethylsilane is a gas at standard temperature and pressure, with a reported boiling point of 6.7°C. Therefore, the requirement to conduct a vapour pressure study is waived because based on boiling point value of <30°C, the vapour pressure is expected to exceed the limit of measurement (i.e. 1E+05 Pa) at ambient temperature.
In contact with water, trimethylsilane hydrolyses slowly to produce trimethylsilanol and hydrogen. The vapour pressures of trimethylsilanol were determined to be 1290 Pa at 20°C and 1900 Pa at 25°C in accordance with a relevant test method and in compliance with GLP.
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