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EC number: 247-768-5 | CAS number: 26537-19-9
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:
- 2013
- 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:
- Regulation (EC) No. 761/2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- dynamic method
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 1.36 hPa
- Remarks on result:
- other: The calculated vapour pressure values are extrapolated.
- Conclusions:
- The vapour pressure was measured with the dynamic method. The calculated vapour pressure values are extrapolated. the vapour pressure is 1.36 hPa at 20 °C.
- Executive summary:
A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 761/2009, method A.4 in order to determine the vapour pressure of the test item by using the dynamic method. The vapour pressure was measured by determining the boiling point of the test item at various specified pressures between about 10 and 1000 hPa. A constant temperature under constant pressure indicated that the boiling point was reached. Different vapour pressures were measured within the temperature range of 20 to 250 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 136 Pa (20 °C), 207 (25 °C) and 143 Pa (50 °C).
Reference
Vapeur Pressure (Dynamic Method)
The vapour pressure was measured with the dynamic method in the temperature range of 124 °C to238 °C. The measured vapour pressures at the corresponding temperatures are listed in the following
table:
| Temperature / °C | Vapour pressure / hPa |
| 124.1 | 9 |
| 147.5 | 29 |
| 159.8 | 49 |
| 169.5 | 74 |
| 176.4 | 99 |
| 190.1 | 158 |
| 202.7 | 250 |
| 211.3 | 319 |
| 221.2 | 397 |
| 231.0 | 503 |
| 238.1 | 598 |
The vapour pressure (logarithmic scale) is a function of the inverse temperature (1/T, Tin Kelvin). Only for better readability the temperature is reported in a centigrade
scale. The values for 20, 25 and 50 °C are calculated, using the Antoine constants.
| T / °C | p / hPa | P / Pa |
| 20 | 1.36 | 136 |
| 25 | 2.07 | 207 |
| 50 | 1.43 | 143 |
Description of key information
The vapour pressure was measured with the dynamic method. The calculated vapour pressure values are extrapolated. the vapour pressure is 1.36 hPa at 20 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 1.36 hPa
- at the temperature of:
- 20 °C
Additional information
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