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EC number: 436-120-9 | CAS number: 99627-05-1
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:
- 2000-06-14 to 21
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- 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:
- no
- Type of method:
- dynamic method
- Key result
- Test no.:
- #1
- Temp.:
- 25 °C
- Vapour pressure:
- 1.7 hPa
- Test no.:
- #2
- Temp.:
- 50 °C
- Vapour pressure:
- 7.4 hPa
- Conclusions:
- The vapour pressure for 25 °C was determined to be 1.7 hPa.
- Executive summary:
A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item using the dynamic method. A vapour pressure curve with 12 data points was measured over a pressure range between 77.5 to 185°C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation was derived and the vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 25 and 50°C. The vapour pressure was determined to be1.7 hPa at 25°C, 7.4 hPa at 25°C respectively.
Reference
Dynamic method
The vapour pressure was measured in the temperature range of 77.5 °C to 185 °C.
Temperature [°C] |
vapour pressure [hPa] |
94.5 |
60.8 |
108.6 |
100.6 |
128.0 |
181.2 |
143.1 |
299.5 |
164.1 |
541.4 |
184.9 |
960.2 |
175.1 |
747.0 |
154.0 |
411.3 |
136.0 |
238.6 |
119.3 |
140.9 |
100.1 |
80.0 |
77.5 |
25.1 |
The values for 25 and 50 °C and for 1013 hPa are calculated, using the Antoine constants A, B and C as shown. The vapour pressure value for 25 °C was extrapolated to be 1.7 hPa. The vapour pressure value for 50 °C was extrapolated to be 7.4 hPa.
Description of key information
The vapour pressure at 25 °C was determined to be 1.7 hPa (reference 4.6 -1).
Key value for chemical safety assessment
- Vapour pressure:
- 1.7 hPa
- at the temperature of:
- 25 °C
Additional information
A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item using the dynamic method (reference 4.6 -1). A vapour pressure curve with 12 data points was measured over a pressure range between 77.5 to 185°C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation was derived and the vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 25 and 50°C. The vapour pressure was determined to be1.7 hPa at 25°C, 7.4 hPa at 25°C respectively.
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