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EC number: 269-847-3 | CAS number: 68345-17-5
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 10 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 16 Pa
- Conclusions:
- The vapour pressure of the test item at 20 °C was determined to be 10 Pa.
- Executive summary:
An experimental study was conducted to determine the vapour pressure of the test item using the dynamic method. The performance of the study was equivalent to OECD 104 and Regulation (EC) No 440/2008, Method A.4. The vapour pressure of the test item was determined in the temperature range from 45 to 185 °C. From the experimental results the Antoine coefficients were determined. The vapour pressure of the test item was extrapolated with the Antoine equation to be 10 Pa and 16 Pa at 20 °C and 25 °C, respectively.
Reference
The vapour pressure of the test item was determined in the temperature range from 45 to 185 °C.
The Antoine coefficients were determined from the measured temperature-vapour pressure curve to be:
Coefficient A = 7.20125
Coefficient B = 1663.03
Coefficient C = 182.626
Antoine equation: log p (mbar) = A – B / (T + C)
Temperature | Vapour pressure (exp.) |
°C | mbar |
48.05 | 0.98 |
54.87 | 1.58 |
64.66 | 3.02 |
76.26 | 6.01 |
83.24 | 8.75 |
104.87 | 26.10 |
120.13 | 50.70 |
131.09 | 78.80 |
142.36 | 120.10 |
151.29 | 164.70 |
163.88 | 251.60 |
175.08 | 356.90 |
183.69 | 461.90 |
With the determined coefficients the vapour pressure at 20 °C and 25 °C was extrapolated to be 0.10 mbar (10 Pa) and 0.16 mbar (16 Pa), respectively.
Description of key information
The vapour pressure of the test item at 20 °C was determined to be 10 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 10 Pa
- at the temperature of:
- 20 °C
Additional information
An experimental study was conducted to determine the vapour pressure of the test item using the dynamic method. The performance of the study was equivalent to OECD 104 and Regulation (EC) No 440/2008, Method A.4. The vapour pressure of the test item was determined in the temperature range from 45 to 185 °C. From the experimental results the Antoine coefficients were determined. The vapour pressure of the test item was extrapolated with the Antoine equation to be 10 Pa and 16 Pa at 20 °C and 25 °C, respectively.
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