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EC number: 812-241-6 | 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:
- 05 September - 07 October 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- The study was conducted according to an internationally recognised method, and under GLP. No deviation was reported. Test substance is adequately specified. Therefore full validation applies.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- effusion method: Knudsen cell
- Specific details on test material used for the study:
- Molecular weight: For the calculation of the vapour pressure a molecular mass range of 180 - 12 600 g/mol was used.
- Key result
- Test no.:
- #1
- Temp.:
- ca. 20 °C
- Vapour pressure:
- >= 0 - <= 0 Pa
- Remarks on result:
- other:
- Remarks:
- The results were extrapolated from the regression equation and the limit values of the molecular mass of the test item
- Key result
- Test no.:
- #2
- Temp.:
- ca. 25 °C
- Vapour pressure:
- >= 0 - <= 0 Pa
- Remarks on result:
- other:
- Remarks:
- The results were extrapolated from the regression equation and the limit values of the molecular mass of the test item
- Conclusions:
- The vapor pressure of the test substance has been determined to be between 1.02 * 10-05 Pa and 8.55 * 10-05 Pa at 25 °C and between 6.75 * 10-06 Pa and 5.65 * 10-05 Pa at 20°C.
Low volatility (based on volatility bands criteria for occupational exposure (ECHA guidance R14, v2.1, 2012), < 500 Pa). - Executive summary:
The vapour pressure of the test substance was measured under GLP according to OECD 104 / EU A4 guideline using a effusion method (knudsen cell). Six determinations were conducted at 30, 45, 60, 75 and 105°C,but experience of 30, 45 and 105°C were not used to avoid bias the whole measurements.
The linearity obtained after series testing of the cells for 3 replicates x 3 temperatures (without sample renewal) shows there is no high difference in volatility of the constituents of the substance in the measuring range. However, extrapolation should be considered with caution.
Vapour pressure at 20 and 25°C was extrapolated from the regression and the limited values of the molecular mass of the test item.
The vapor pressure of the test substance has been determined to be between 1.02 * 10-05 Pa and 8.55 * 10-05 Pa at 25 °C and between 6.75 * 10-06 Pa and 5.65 * 10-05 Pa at 20°C.
Reference
Findings
Sample Weights
The mass of sample in the respective cell is presented in the following table:
Table 4.6/4.-Sample Weights
Parameter |
Cell empty |
Cell + test item |
Cell + test item + cap |
Test item |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
2.60932 |
3.25323 |
3.50733 |
0.64391 |
Knudsen-cell 2 |
2.59256 |
3.22867 |
3.48585 |
0.63611 |
Knudsen-cell 3 |
2.56982 |
3.22749 |
3.48377 |
0.65767 |
Knudsen-cell 4 |
2.56323 |
3.20617 |
3.46515 |
0.64294 |
Measurement Data
The data of the evaluated experiments is presented in the following tables:
Table 4.6/5.- Measurement Data Experiment 1
Experiment |
1 |
|
|
|
Nom. Temperature |
30 |
°C |
|
|
Date and time START |
|
05.09.2016 16:15 |
06.09.2016 14:00 |
07.09.2016 13:55 |
Date and time END |
|
06.09.2016 12:40 |
07.09.2016 11:30 |
08.09.2016 12:43 |
Parameter |
Weight m |
Weight m |
Weight m |
Weight m |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
3.50733 |
3.47828 |
3.47647 |
3.47455 |
Knudsen-cell 2 |
3.48585 |
3.45706 |
3.45522 |
3.45331 |
Knudsen-cell 3 |
3.48377 |
3.45396 |
3.45210 |
3.45015 |
Knudsen-cell 4 |
3.46515 |
3.43583 |
3.43401 |
3.43214 |
Table 4.6/6 Measurement Data Experiment 2
Experiment |
2 |
|
|
|
Nom. Temperature |
45 |
°C |
|
|
Date and time START |
|
08.09.2016 13:30 |
12.09.2016 07:58 |
13.09.2016 13:40 |
Date and time END |
|
09.09.2016 12:50* |
13.09.2016 12:48 |
14.09.2016 12:35 |
Parameter |
Weight m |
Weight m |
Weight m |
Weight m |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
3.47455 |
3.47173 |
3.47187 |
3.47127 |
Knudsen-cell 2 |
3.45331 |
3.45060 |
3.45071 |
3.45016 |
Knudsen-cell 3 |
3.45015 |
3.44727 |
3.44738 |
3.44682 |
Knudsen-cell 4 |
3.43214 |
3.42935 |
3.42949 |
3.42883 |
*The samples were stored in an exsiccator after the weighings until start of the next measurement series due to organisational reasons.
Table 4.6/7.- Measurement Data Experiment 3
Experiment |
3 |
|
|
|
Nom. Temperature |
60 |
°C |
|
|
Date and time START |
|
14.09.2016 13:25 |
19.09.2016 13:00 |
20.09.2016 13:55 |
Date and time END |
|
15.09.2016 12:50* |
20.09.2016 12:45 |
21.09.2016 12:50 |
Parameter |
Weight m |
Weight m |
Weight m |
Weight m |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
3.47127 |
3.47100 |
3.47080 |
3.47063 |
Knudsen-cell 2 |
3.45016 |
3.44991 |
3.44967 |
3.44947 |
Knudsen-cell 3 |
3.44682 |
3.44654 |
3.44629 |
3.44612 |
Knudsen-cell 4 |
3.42883 |
3.42858 |
3.42844 |
3.42827 |
*The samples were stored in an exsiccator after the weighings until start of the next measurement series due to organisational reasons.
Table 4.6/8.- Measurement Data Experiment 4
Experiment |
4 |
|
|
|
Nom. Temperature |
75 |
°C |
|
|
Date and time START |
|
21.09.2016 14:20 |
22.09.2016 13:57 |
26.09.2016 09:35 |
Date and time END |
|
22.09.2016 12:38 |
23.09.2016 12:50* |
27.09.2016 12:42 |
Parameter |
Weight m |
Weight m |
Weight m |
Weight m |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
3.47063 |
3.47008 |
3.46958 |
3.46912 |
Knudsen-cell 2 |
3.44947 |
3.44903 |
3.44847 |
3.44806 |
Knudsen-cell 3 |
3.44612 |
3.44556 |
3.44495 |
3.44446 |
Knudsen-cell 4 |
3.42827 |
3.42773 |
3.42707 |
3.42656 |
*The samples were stored in an exsiccator after the weighings until start of the next measurement series due to organisational reasons.
Table 4.7/9.- Measurement Data Experiment 5
Experiment |
5 |
|
|
|
Nom. Temperature |
90 |
°C |
|
|
Date and time START |
|
27.09.2016 13:30 |
28.09.2016 13:11 |
29.09.2016 14:00 |
Date and time END |
|
28.09.2016 12:47 |
29.09.2016 13:00 |
30.09.2016 13:20* |
Parameter |
Weight m |
Weight m |
Weight m |
Weight m |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
3.46912 |
3.46753 |
3.46592 |
3.46521 |
Knudsen-cell 2 |
3.44806 |
3.44666 |
3.44529 |
3.44467 |
Knudsen-cell 3 |
3.44446 |
3.44303 |
3.44150 |
3.44073 |
Knudsen-cell 4 |
3.42656 |
3.42476 |
3.42340 |
3.42255 |
*The samples were stored in an exsiccator after the weighings until start of the next measurement series due to organisational reasons.
Table 4.6/10.- Measurement Data Experiment 6
Experiment |
6 |
|
|
|
Nom. Temperature |
105 |
°C |
|
|
Date and time START |
|
04.10.2016 11:00 |
05.10.2016 11:43 |
06.10.2016 11:40 |
Date and time END |
|
05.10.2016 10:30 |
06.10.2016 10:40 |
07.10.2016 10:30 |
Parameter |
Weight m |
Weight m |
Weight m |
Weight m |
Unit |
g |
g |
g |
g |
Knudsen-cell 1 |
3.46521 |
3.46056 |
3.45866 |
3.45712 |
Knudsen-cell 2 |
3.44467 |
3.44084 |
3.43891 |
3.43750 |
Knudsen-cell 3 |
3.44073 |
3.43635 |
3.43431 |
3.43286 |
Knudsen-cell 4 |
3.42255 |
3.41780 |
3.41571 |
3.41404 |
Observations
At 105 °C: At the first measurement of 105 °C it was observed that the test item became darker. To avoid bias the whole measurements of 105 °C were not used for calculation.
The molecular weight range used for the calculation was 180 - 12 600g/mol :
Calculation Results for the molecular mass of 180 g/mol
All calculation results are given in the tables below and on the following pages.
In all tables, E-0X represents multiplication with 10-X.
Table 4.6/11.- Calculation Results Experiment 3
Experiment |
3 |
|
|
|
|
|
|
|
|
||
Real Temperature in K |
333.2 |
|
|
|
|
|
|
|
|
||
Real Temperature in °C |
60.0 |
|
|
|
|
|
|
|
|
||
Date of Measurement |
15.09.2016 12:50 |
20.09.2016 12:45 |
21.09.2016 12:50 |
||||||||
Elapsed Time in s |
84300 |
85500 |
82500 |
||||||||
Parameter |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
||
Unit |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
||
Knudsen-cell 1 |
0.00027 |
yes |
1.40E-03 |
0.00020 |
yes |
1.02E-03 |
0.00017 |
yes |
8.98E-04 |
||
Knudsen-cell 2 |
0.00025 |
yes |
1.29E-03 |
0.00024 |
yes |
1.22E-03 |
0.00020 |
yes |
1.06E-03 |
||
Knudsen-cell 3 |
0.00028 |
yes |
1.45E-03 |
0.00025 |
yes |
1.27E-03 |
0.00017 |
yes |
8.98E-04 |
||
Knudsen-cell 4 |
0.00025 |
yes |
1.29E-03 |
0.00014 |
yes |
7.13E-04 |
0.00017 |
yes |
8.98E-04 |
||
Mean |
|
yes |
1.36E-03 |
|
yes |
1.06E-03 |
|
yes |
9.37E-04 |
||
Standard deviation: |
|
|
7.75E-05 |
|
|
2.54E-04 |
|
|
7.92E-05 |
||
Mean of all measured values: |
|
1.117E-03 |
|
|
|
|
|
|
|||
Standard deviation of mean values: |
|
2.159E-04 |
RSD: |
19.3% |
|
|
|
|
|||
Table 4.6/12.- Calculation Results Experiment 4
Experiment |
4 |
|
|
|
|
|
|
|
|
||
Real Temperature in K |
348.2 |
|
|
|
|
|
|
|
|
||
Real Temperature in °C |
75.0 |
|
|
|
|
|
|
|
|
||
Date of Measurement |
22.09.2016 12:38 |
23.09.2016 12:50 |
27.09.2016 12:42 |
||||||||
Elapsed Time in s |
80280 |
82380 |
97620 |
||||||||
Parameter |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
||
Unit |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
||
Knudsen-cell 1 |
0.00055 |
yes |
3.05E-03 |
0.00050 |
yes |
2.70E-03 |
0.00046 |
yes |
2.10E-03 |
||
Knudsen-cell 2 |
0.00044 |
yes |
2.44E-03 |
0.00056 |
yes |
3.03E-03 |
0.00041 |
yes |
1.87E-03 |
||
Knudsen-cell 3 |
0.00056 |
yes |
3.11E-03 |
0.00061 |
yes |
3.30E-03 |
0.00049 |
yes |
2.24E-03 |
||
Knudsen-cell 4 |
0.00054 |
yes |
3.00E-03 |
0.00066 |
yes |
3.57E-03 |
0.00051 |
yes |
2.33E-03 |
||
Mean |
|
yes |
2.90E-03 |
|
yes |
3.15E-03 |
|
yes |
2.13E-03 |
||
Standard deviation: |
|
|
3.08E-04 |
|
|
3.70E-04 |
|
|
1.98E-04 |
||
Mean of all measured values: |
|
2.726E-03 |
|
|
|
|
|
|
|||
Standard deviation of mean values: |
|
5.294E-04 |
RSD: |
19.4% |
|
|
|
|
|||
Table 4.6/13.- Calculation Results Experiment 5
Experiment |
5 |
|
|
|
|
|
|
|
|
||
Real Temperature in K |
363.2 |
|
|
|
|
|
|
|
|
||
Real Temperature in °C |
90.0 |
|
|
|
|
|
|
|
|
||
Date of Measurement |
28.09.2016 12:47 |
29.09.2016 13:00 |
30.09.2016 13:20 |
||||||||
Elapsed Time in s |
83820 |
85740 |
84000 |
||||||||
Parameter |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
||
Unit |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
||
Knudsen-cell 1 |
0.00159 |
yes |
8.63E-03 |
0.00161 |
yes |
8.54E-03 |
0.00071 |
yes |
3.84E-03 |
||
Knudsen-cell 2 |
0.00140 |
yes |
7.60E-03 |
0.00137 |
yes |
7.27E-03 |
0.00062 |
yes |
3.36E-03 |
||
Knudsen-cell 3 |
0.00143 |
yes |
7.76E-03 |
0.00153 |
yes |
8.12E-03 |
0.00077 |
yes |
4.17E-03 |
||
Knudsen-cell 4 |
0.00180 |
yes |
9.77E-03 |
0.00136 |
yes |
7.21E-03 |
0.00085 |
yes |
4.60E-03 |
||
Mean |
|
yes |
8.44E-03 |
|
yes |
7.78E-03 |
|
yes |
3.99E-03 |
||
Standard deviation: |
|
|
9.95E-04 |
|
|
6.52E-04 |
|
|
5.26E-04 |
||
Mean of all measured values: |
|
6.738E-03 |
|
|
|
|
|
|
|||
Standard deviation of mean values: |
|
2.400E-03 |
RSD: |
35.6% |
|
|
|
|
|||
Calculation Results for the molecular mass of 12600 g/mol
All calculation results are given in the tables below and on the following pages.
In all tables, E-0X represents multiplication with 10-X.
Table 4.6/14.- Calculation Results Experiment 3
Experiment |
3 |
|
|
|
|
|
|
|
|
||
Real Temperature in K |
333.2 |
|
|
|
|
|
|
|
|
||
Real Temperature in °C |
60.0 |
|
|
|
|
|
|
|
|
||
Date of Measurement |
15.09.2016 12:50 |
20.09.2016 12:45 |
21.09.2016 12:50 |
||||||||
Elapsed Time in s |
84300 |
85500 |
82500 |
||||||||
Parameter |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
||
Unit |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
||
Knudsen-cell 1 |
0.00027 |
yes |
1.67E-04 |
0.00020 |
yes |
1.22E-04 |
0.00017 |
yes |
1.07E-04 |
||
Knudsen-cell 2 |
0.00025 |
yes |
1.54E-04 |
0.00024 |
yes |
1.46E-04 |
0.00020 |
yes |
1.26E-04 |
||
Knudsen-cell 3 |
0.00028 |
yes |
1.73E-04 |
0.00025 |
yes |
1.52E-04 |
0.00017 |
yes |
1.07E-04 |
||
Knudsen-cell 4 |
0.00025 |
yes |
1.54E-04 |
0.00014 |
yes |
8.52E-05 |
0.00017 |
yes |
1.07E-04 |
||
Mean |
|
yes |
1.62E-04 |
|
yes |
1.26E-04 |
|
yes |
1.12E-04 |
||
Standard deviation: |
|
|
9.26E-06 |
|
|
3.04E-05 |
|
|
9.47E-06 |
||
Mean of all measured values: |
|
1.335E-04 |
|
|
|
|
|
|
|||
Standard deviation of mean values: |
|
2.580E-05 |
RSD: |
19.3% |
|
|
|
|
|||
Table 4.6/15.- Calculation Results Experiment 4
Experiment |
4 |
|
|
|
|
|
|
|
|
||
Real Temperature in K |
348.2 |
|
|
|
|
|
|
|
|
||
Real Temperature in °C |
75.0 |
|
|
|
|
|
|
|
|
||
Date of Measurement |
22.09.2016 12:38 |
23.09.2016 12:50 |
27.09.2016 12:42 |
||||||||
Elapsed Time in s |
80280 |
82380 |
97620 |
||||||||
Parameter |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
||
Unit |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
||
Knudsen-cell 1 |
0.00055 |
yes |
3.65E-04 |
0.00050 |
yes |
3.23E-04 |
0.00046 |
yes |
2.51E-04 |
||
Knudsen-cell 2 |
0.00044 |
yes |
2.92E-04 |
0.00056 |
yes |
3.62E-04 |
0.00041 |
yes |
2.24E-04 |
||
Knudsen-cell 3 |
0.00056 |
yes |
3.71E-04 |
0.00061 |
yes |
3.94E-04 |
0.00049 |
yes |
2.67E-04 |
||
Knudsen-cell 4 |
0.00054 |
yes |
3.58E-04 |
0.00066 |
yes |
4.26E-04 |
0.00051 |
yes |
2.78E-04 |
||
Mean |
|
yes |
3.46E-04 |
|
yes |
3.76E-04 |
|
yes |
2.55E-04 |
||
Standard deviation: |
|
|
3.69E-05 |
|
|
4.43E-05 |
|
|
2.37E-05 |
||
Mean of all measured values: |
|
3.259E-04 |
|
|
|
|
|
|
|||
Standard deviation of mean values: |
|
6.327E-05 |
RSD: |
19.4% |
|
|
|
|
|||
Table 4.6/16.- Calculation Results Experiment 5
Experiment |
5 |
|
|
|
|
|
|
|
|
||
Real Temperature in K |
363.2 |
|
|
|
|
|
|
|
|
||
Real Temperature in °C |
90.0 |
|
|
|
|
|
|
|
|
||
Date of Measurement |
28.09.2016 12:47 |
29.09.2016 13:00 |
30.09.2016 13:20 |
||||||||
Elapsed Time in s |
83820 |
85740 |
84000 |
||||||||
Parameter |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
Weight loss |
to be used |
Vapour pressure |
||
Unit |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
g |
yes/no |
Pa |
||
Knudsen-cell 1 |
0.00159 |
yes |
1.03E-03 |
0.00161 |
yes |
1.02E-03 |
0.00071 |
yes |
4.59E-04 |
||
Knudsen-cell 2 |
0.00140 |
yes |
9.08E-04 |
0.00137 |
yes |
8.69E-04 |
0.00062 |
yes |
4.01E-04 |
||
Knudsen-cell 3 |
0.00143 |
yes |
9.27E-04 |
0.00153 |
yes |
9.70E-04 |
0.00077 |
yes |
4.98E-04 |
||
Knudsen-cell 4 |
0.00180 |
yes |
1.17E-03 |
0.00136 |
yes |
8.62E-04 |
0.00085 |
yes |
5.50E-04 |
||
Mean |
|
yes |
1.01E-03 |
|
yes |
9.30E-04 |
|
yes |
4.77E-04 |
||
Standard deviation: |
|
|
1.19E-04 |
|
|
7.79E-05 |
|
|
6.28E-05 |
||
Mean of all measured values: |
|
8.053E-04 |
|
|
|
|
|
|
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Standard deviation of mean values: |
|
2.868E-04 |
RSD: |
35.6% |
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Evaluation
The measured values for temperature and vapour pressure were evaluated as follows:
Table 4.6/17.- Evaluation of Calculated Values for the molecular mass of 180 g/mol
Parameter |
T |
Mean P |
1/T |
log P |
Unit |
K / °C |
Pa |
1/K |
log Pa |
Values |
333.2 / 60 |
1.12E-03 |
3.0012E-03 |
-2.9520 |
348.2 / 75 |
2.73E-03 |
2.8719E-03 |
-2.5644 |
|
363.2 / 90 |
6.74E-03 |
2.7533E-03 |
-2.1715 |
In this table, E-0X represents multiplication with 10-X.
Table 4.6/18.- Evaluation of Calculated Values for the molecular mass of 12600 g/mol
Parameter |
T |
Mean P |
1/T |
log P |
Unit |
K / °C |
Pa |
1/K |
log Pa |
Values |
333.2 / 60 |
1.33E-04 |
3.0012E-03 |
-3.8745 |
348.2 / 75 |
3.26E-04 |
2.8719E-03 |
-3.4870 |
|
363.2 / 90 |
8.05E-04 |
2.7533E-03 |
-3.0940 |
In this table, E-0X represents multiplication with 10-X.
Graphs with log P vs. 1/T were plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression. The Graph for the molecular mass of 180 g/mol and the Graph for the molecular mass of 12600 g/mol could be seen in the report.
Table 4.6 /19.- Parameters of Linear Regression for the molecular mass of 180 g/mol
Parameter |
Value |
Slope |
-3146.3 |
Intercept |
6.4844 |
Correlation Coefficient r |
-0.9996 |
Coefficient of Determination r2 |
0.9992 |
Table 4.6/20.- Parameters of Linear Regression for the molecular mass of 12600 g/mol
Parameter |
Value |
Slope |
-3146.3 |
Intercept |
5.5618 |
Correlation Coefficient r |
-0.9996 |
Coefficient of Determination r2 |
0.9992 |
Results
The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):
Table 4.6/21.- Experimentally Determined Vapour Pressures for the molecular mass of 180 g/mol
T |
T |
P |
Stand. Dev. P |
RSD P |
°C |
K |
Pa |
Pa |
% |
60.0 |
333.2 |
1.12E-03 |
2.16E-04 |
19.3 |
75.0 |
348.2 |
2.73E-03 |
5.29E-04 |
19.4 |
90.0 |
363.2 |
6.74E-03 |
2.40E-03 |
35.6 |
Table 4.6/22.- Experimentally Determined Vapour Pressures for the molecular mass of 180 g/mol
T |
T |
P |
Stand. Dev. P |
RSD P |
°C |
K |
Pa |
Pa |
% |
60.0 |
333.2 |
1.33E-04 |
2.58E-05 |
19.3 |
75.0 |
348.2 |
3.26E-04 |
6.33E-05 |
19.4 |
90.0 |
363.2 |
8.05E-04 |
2.87E-04 |
35.6 |
The linear regression of log P vs. 1/T gave a correlation coefficient r of - 0.9996, showing good repeatability and precision. Therefore, the determination is considered as valid.
For the test item, the following ranges of the vapour pressure at 20 °C and at 25 °C were extrapolated from the regression equation and the limit values of the molecular mass of the test item:
Vapour pressure at 20°C: |
6.75* 10-06Pa- 5.65* 10-05Pa |
Vapour pressure at 25°C: |
1.02* 10-05Pa- 8.55* 10-05Pa |
Description of key information
Low volatility. The key value, 3.1625 10-5 Pa, is the mean of the 2 limit values:
Vapour pressure at 20°C: |
6.75* 10-06Pa- 5.65* 10-05Pa |
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. It is considered as a key study.
Six determinations were conducted at 30, 45, 60, 75 and 105°C,but experience of 30, 45 and 105°C were not used to avoid bias the whole measurements.
The linearity obtained after series testing of the cells for 3 replicates x 3 temperatures (without sample renewal) shows there is no high difference in volatility of the constituents of the substance in the measuring range. However, extrapolation should be considered with caution.
Vapour pressure at 20 and 25°C was extrapolated from the regression and the limited values of the molecular mass of the test item.
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