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EC number: 253-634-7 | CAS number: 37697-65-7
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:
- 2015-06-30 to 2015-07-15
- 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 and in compliance with a known quality system (ISO 9001:2008)
- 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
- Remarks:
- ISO 9001:2008
- Type of method:
- effusion method: Knudsen cell
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.029 hPa
- Key result
- Test no.:
- #2
- Temp.:
- 50 °C
- Vapour pressure:
- 0.29 hPa
- Conclusions:
- Vapour pressure values of 2.9 Pa at 20°C and 29 Pa at 50°C were determined for the substance using a relevant test method. The result is 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] |
30.06.2015 |
08:00 |
20 |
38.51910 |
37.70250 |
38.77220 |
39.41680 |
30.06.2015 |
12:50 |
20 |
38.41930 |
37.60720 |
38.66310 |
39.31510 |
30.06.2015 |
13:30 |
30 |
38.50930 |
37.63890 |
38.69060 |
39.40270 |
30.06.2015 |
15:30 |
30 |
38.42140 |
37.56630 |
38.60760 |
39.31650 |
01.07.2015 |
13:45 |
50 |
38.26090 |
37.44360 |
38.60420 |
39.32160 |
01.07.2015 |
15:30 |
50 |
37.91820 |
37.14800 |
38.20430 |
38.97330 |
Calculation of Loss of Masses
Temperature [°C] |
Period of time [sec] |
Calculated loss of mass Average [mg] |
20 |
17400 |
101.47 |
30 |
7200 |
82.42 |
50 |
6300 |
346.63 |
Calculation of the Reliance log p to 1/T
Temperature [°C] |
log p [hPa] |
1/T [K-1] |
20 |
-1.51999 |
0.003411 |
30 |
-1.21979 |
0.003299 |
50 |
-0.52412 |
0.003095 |
Formula of regression |
log p [hPa] = -3176.47 1/T [1/K] + 9.29323 |
|
Results from Calculation
Estimated vapour pressure* (hPa) |
Temperature [°C] |
0.029 |
20 |
0.29 |
50 |
*The estimated values were calculated using the formula of regression
Description of key information
Vapour pressure [1-methyl-N,N',N''-tris(1-methylpropyl)silanetriamine]: 0.029 hPa at 20°C and 0.29 hPa at 50°C (EU Method A.4)
Vapour pressure [methylsilanetriol]: 0.053 Pa at 25°C (QSAR)
Vapour pressure [sec-butylamine]: ca. 24000 Pa at 25°C
Key value for chemical safety assessment
- Vapour pressure:
- 0.029 hPa
- at the temperature of:
- 20 °C
Additional information
Measured vapour pressure values of 0.029 hPa at 20°C and 0.29 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 sec-butylamine (CAS No. 13952 -84 -6).
The vapour pressure of the silanol hydrolysis product, methylsilanetriol was predicted to be 0.053 Pa at 25°C using a validated QSAR estimation method.
A vapour pressure of approximately 24000 Pa at 25°C was reported for sec-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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