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EC number: - | 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 2019-02-12 to 2019-02-13
- 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:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2008
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 5 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 7 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 47 Pa
- Conclusions:
- The vapour pressure of the test item at 20 °C was determined to be 5 Pa.
- Executive summary:
An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC), Method A.4. and OECD 104 using the dynamic method. The vapour pressure was determined in a range of 119.6 to 161.1 °C. The vapour pressures of the test item were calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 5 Pa, 7 Pa and 47 Pa, respectively.
Reference
The vapour pressure was measured in the temperature range of 119.6 to 161.1 °C. The results are summarized in the next table.
No. | Temperature / °C | Vapour pressure / hPa | Remark |
1 | 119.6 | 24.8 | Measured up |
2 | 133.8 | 49.3 | Measured up |
3 | 143.4 | 74.2 | Measured up |
4 | 150.6 | 98.6 | Measured up |
5 | 156.5 | 124.5 | Measured up |
6 | 161.1 | 147.8 | Measured up |
7 | 154.3 | 114.7 | Measured down |
8 | 146.4 | 84.7 | Measured down |
9 | 137.5 | 59.8 | Measured down |
From the measured data points of the vapour pressure curve the constants A, B and C of the
Antoine equation
Antoine equation: log p = A – B / (T + C)
A = 11.4546
B = -3160.25
C = 273.15
The vapour pressures of the test item were calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 5 Pa, 7 Pa and 47 Pa, respectively.
Description of key information
The vapour pressures of the test item were calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 5 Pa, 7 Pa and 47 Pa, respectively.
Key value for chemical safety assessment
- Vapour pressure:
- 5 Pa
- at the temperature of:
- 20 °C
Additional information
An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC), Method A.4. and OECD 104 using the dynamic method. The vapour pressure was determined in a range of 119.6 to 161.1 °C. The vapour pressures of the test item were calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 5 Pa, 7 Pa and 47 Pa, respectively.
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