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EC number: 806-801-9 | CAS number: 1539267-56-5
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:
- 21 October 2019 to 22 October 2019
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 23 March 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 4 March 2016
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
- Specific details on test material used for the study:
- No correction for purity was required.
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- <= 0 Pa
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- <= 0 Pa
- Conclusions:
- Under the conditions of the study, the vapour pressure of the test material was determined to be = 0.00000085 Pa at 20 °C and = 0.0000018 Pa at 25 °C.
- Executive summary:
The vapour pressure of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions.
The isothermal TGA effusion method was applied for the determination of the vapour pressure of the test material. The weight losses of the test material had to be determined at temperatures above the melting temperature of the test material. According to this, the vapour pressure of the test material (which was, according to the method, extrapolated to 20 °C and 25 °C) could be slightly overestimated and is reported as less than or equal to values.
Under the conditions of the study, the vapour pressure of the test material was determined to be = 0.00000085 Pa at 20 °C and = 0.0000018 Pa at 25 °C.
Reference
A representative weight loss curve of the test material is shown in Figure 1 (attached). The vapour pressure regression curve of the log PT of the test material as function of the reciprocal temperatures is shown in Figure 2 (attached). The equation of the curve was:
log PT = -5836 × 1/T + 13.84 (r = 0.9994, n = 8).
Results of the Vapour pressure Isothermal TGA Analysis
Temperature [°C] |
Weight Loss [µg/min] |
VT [g/cm2/h] |
Log vT |
Log PT |
P [Pa] |
150 |
0.732763 |
8.75 x 10-5 |
-4.06 |
0.06 |
1.1 |
0.679830 |
8.11 x 10-5 |
-4.09 |
0.02 |
1.1 |
|
160 |
1.40352 |
1.68 x 10-4 |
-3.78 |
0.38 |
2.4 |
1.33481 |
1.59 x 10-4 |
-3.80 |
0.35 |
2.3 |
|
170 |
2.55044 |
3.04 x 10-4 |
-3.52 |
0.67 |
4.7 |
2.49941 |
2.98 x 10-4 |
-3.53 |
0.66 |
4.6 |
|
180 |
4.55551 |
5.44 x 10-4 |
-3.26 |
0.95 |
9.0 |
4.64634 |
5.55 x 10-4 |
-3.26 |
0.96 |
9.2 |
Vapour Pressure of the Test Material
Temperature [°C] |
Log PT |
PT [Pa] |
PT [mm Hg] |
20 |
-6.07 |
8.5 x 10-7 |
6.3 x 10-9 |
25 |
-5.74 |
1.8 x 10-6 |
1.4 x 10-8 |
Reference Substances
Reference Substance |
Reference PTValues 20 °C |
Corresponding PTValues 25 °C |
||
[Pa] |
[mm Hg] |
[Pa] |
[mm Hg] |
|
Benzo(ghi)perylene |
1.33 x 10-8 |
1.00 x 10-10 |
4.31 x 10-8 |
3.23 x 10-10 |
Chrysene |
8.40 x 10-7 |
6.30 x 10-9 |
8.02 x 10-7 |
6.02 x 10-9 |
Hexachlorobenzene |
1.47 x 10-3 |
1.10 x 10-5 |
6.25 x 10-3 |
4.69 x 10-5 |
Naphthalene |
7.56 x 100 |
5.67 x 10-2 |
1.15 x 101 |
8.61 x 10-2 |
Water |
2.34 x 103 |
1.75 x 101 |
3.17 x 103 |
2.38 x 101 |
Description of key information
The vapour pressure of the test material was determined to be = 0.00000085 Pa at 20 °C and = 0.0000018 Pa at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the test material was investigated in a study which was conducted in accordance with the standardised guidelines OECD 104 and EU Method A.4, under GLP conditions.
The isothermal TGA effusion method was applied for the determination of the vapour pressure of the test material. The weight losses of the test material had to be determined at temperatures above the melting temperature of the test material. According to this, the vapour pressure of the test material (which was, according to the method, extrapolated to 20 °C and 25 °C) could be slightly overestimated and is reported as less than or equal to values.
Under the conditions of the study, the vapour pressure of the test material was determined to be = 0.00000085 Pa at 20 °C and = 0.0000018 Pa at 25 °C.
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