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EC number: 701-378-6 | CAS number: -
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:
- From 05 July 2017 to 06 July 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Key result
- Test no.:
- #1
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 0 Pa
- Remarks on result:
- other: equivalent to 2.8-10E8
- Key result
- Test no.:
- #2
- Temp.:
- ca. 25 °C
- Vapour pressure:
- ca. 0 Pa
- Remarks on result:
- other: equivalent to 6-10E8
- Conclusions:
- Under the study conditions, the vapour pressure of the test substance was determined to be 3.8E-06 Pa at 20°C and 8.0E-06 Pa at 25°C.
- Executive summary:
A stuyd was conducted to determine the vapour pressure of the test substance, Oleyl TMAC (91.9% active), using the isothermal thermogravimetric effusion method, according to EU Method A.4, OECD Guideline 104 and EPA Guideline OPPTS 830.7950, in compliance with GLP. A vapour pressure curve was constructed from duplicate measurements at temperatures between 170°C and 190°C. Under the study conditions, the vapour pressure of the substance at 25°C and at 20°C was determined by extrapolation to be 8.0E-06 Pa and 3.8E-06 Pa, respectively (Reingruber, 2017).
Reference
Results
In Experiment 1 and Experiment 2 interpretable weight loss data was gathered only in the range of 170°C – 190°C. At lower temperatures weigth loss was most likely dominated by the evaporation of impurities with higher volatility such as isopropylic alcohol and water. In order to gather more data in the range of 170°C – 190°C, weight loss in this range was determined every 5°C during Experiment 3. In Experiment 3, however, decomposition started from 185°C. From this temperature on the weight did not decrease constantly with time during the isothermal step. A colour change of the test substance had was observed after the experiment. Therefore, weight losses obtained from 170°C – 180°C in Experiment 3 were used for calculating the vapour pressure. Gathered weight loss data was evaluated using the criterion that the coefficient of correlation of the vapour pressure regression curve of log PT of the test substance versus 1/T should be > 0.99. Since the coefficient of correlation was > 0.99 using data of Experiment 2 and Experiment 3 only, the results from Experiment 1 were excluded and not used in further calculations of the vapour pressure of the test substance. The results of the isothermal TGA analysis for the test substance were recorded. The vapour pressure at 20°C and 25°C calculated using the curve obtained with the data of Experiment 2 and Experiment 3 was recorded. The plot of the log PT of the test substance as function of the reciprocal temperatures was recorded. The equation of the curve was:
log PT = -5715 * 1/T + 14.07 (r = 0.992, n = 6).
Results of the Vapour pressure Isothermal TGA Analysis
Experiment |
Temperature[°C] |
Weight loss [µg/min] |
νT [g/cm2/h] |
log νT |
log PT |
PT [Pa] |
1* |
170 |
6.82908 |
8.15E-04 |
-3.09 |
1.09 |
12 |
|
180 |
10.6979 |
1.28E-03 |
-2.89 |
1.34 |
22 |
|
190 |
20.1072 |
2.40E-03 |
-2.62 |
1.68 |
48 |
2 |
170 |
8.60725 |
1.03E-03 |
-2.99 |
1.22 |
17 |
|
180 |
12.7354 |
1.52E-03 |
-2.82 |
1.43 |
27 |
|
190 |
22.9053 |
2.73E-03 |
-2.56 |
1.75 |
57 |
3 |
170 |
7.81883 |
9.33E-04 |
-3.03 |
1.17 |
15 |
|
175 |
9.96265 |
1.19E-03 |
-2.92 |
1.30 |
20 |
|
180 |
13.5559 |
1.62E-03 |
-2.79 |
1.47 |
29 |
*Experiment 1 was not used in the calculation.
Vapour Pressure of the Test Substance
Temperature[°C] |
log PT |
PT [Pa] |
PT [mm Hg] |
20 |
-5.42 |
3.8E-06 |
2.8E-08 |
25 |
-5.10 |
8.0E-06 |
6.0E-08 |
Description of key information
The vapour pressure of the test substance was determined using the isothermal thermogravimetric effusion method, according to EU Method A.4, OECD Guideline 104 and EPA Guideline OPPTS 830.7950 (Reingruber, 2017).
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
(3.8E-06 Pa at 20°C)
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