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EC number: 240-462-2 | CAS number: 16411-33-9
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2015-08-05 to 2015-08-06
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- The study was conducted according to an appropriate OECD test guideline. It was not compliant with GLP.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- no
- Other quality assurance:
- other: ISO 9001:2008
- Type of method:
- effusion method: Knudsen cell
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.018 hPa
- Key result
- Test no.:
- #2
- Temp.:
- 50 °C
- Vapour pressure:
- 0.083 hPa
- Conclusions:
- Vapour pressure values of 0.018 hPa at 20°C and 0.083 hPa at 50°C were obtained for the substance using a relevant test method. The results are considered to be reliable.
Reference
Raw Data
Date (start And termination) |
Time (start and termination) |
Temperature [°C] |
Weight cell 1 [g] |
Weight cell 2 [g] |
Weight cell 3 [g] |
Weight cell 4 [g] |
05.08.2015 |
12:30 |
20 |
38.3652 |
37.5332 |
38.6306 |
39.2226 |
05.08.2015 |
14:30 |
20 |
38.3426 |
37.5110 |
38.6077 |
39.1985 |
06.08.2015 |
07:45 |
30 |
39.4643 |
38.5882 |
39.6518 |
40.2772 |
06.08.2015 |
09:45 |
30 |
39.4319 |
38.5542 |
39.6173 |
40.2446 |
06.08.2015 |
10:00 |
50 |
38.5851 |
37.6685 |
38.9290 |
39.4957 |
06.08.2015 |
11:15 |
50 |
38.5267 |
37.6061 |
38.8667 |
39.4345 |
Calculation of Loss of Masses
Temperature [°C] |
Period of time [sec] |
Calculated loss of mass Average [mg] |
20 |
7200 |
22.95 |
30 |
7200 |
33.38 |
50 |
4500 |
61.08 |
Calculation of Vapour Pressures
Temperature [°C] |
Vapour pressure [hPa] |
20 |
0.0191 |
30 |
0.028246 |
50 |
0.085386 |
Calculation of the Reliance log p to 1/T
Temperature [°C] |
log p [hPa] |
1/T [K-1] |
20 |
-1.71897 |
0.003411 |
30 |
-1.54904 |
0.003299 |
50 |
-1.06861 |
0.003095 |
Formula of regression |
log p [hPa] = -2089.87 1/T [1/K] + 5.38449 |
|
Results from Calculation
Temperature [°C] |
Estimated vapour pressure* [hPa] |
20 |
0.018 |
30 |
0.083 |
*The estimated values were calculated using the formula of regression.
Description of key information
Vapour pressure [N,N',N''-tributyl-1-methylsilanetriamine]: 0.018 hPa at 20°C and 0.083 hPa at 50°C (EU Method A.4)
Vapour pressure [methylsilanetriol]: 0.05 Pa at 25°C (QSAR)
Vapour pressure [n-butylamine]: approximately 12400 Pa at 25°C
Key value for chemical safety assessment
- Vapour pressure:
- 0.018 hPa
- at the temperature of:
- 20 °C
Additional information
Measured vapour pressure values of 0.018 hPa at 20°C and 0.083 hPa at 50°C were determined for the submission substance in accordance with EU Test Method A.4 and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable and is selected as key study.
In contact with water, the submission substance hydrolyses very rapidly to form methylsilanetriol (CAS No. 2445-53-6) and n-butylamine (CAS No. 109-73-9).
The vapour pressure of the silanol hydrolysis product, methylsilanetriol was predicted to be 0.05 Pa at 25°C using a validated QSAR estimation method.
A vapour pressure of approximately 12400 Pa at 25°C was reported for n-butylamine (Daubert and Danner 1989).
Reference:
Daubert, T.E., R.P. Danner (1989). Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. Washington, D.C.: Taylor and Francis
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