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EC number: 205-516-1 | CAS number: 141-97-9
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:
- 2009
- 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
- Specific details on test material used for the study:
- - Purity: 99.72%
- Batch: not mentioned - Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.26 hPa
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0.42 hPa
- Key result
- Test no.:
- #3
- Temp.:
- 50 °C
- Vapour pressure:
- 3.5 hPa
- Key result
- Transition / decomposition:
- no
- Conclusions:
- The vapor pressure was determined to be 0.26 hPa at 20°C, 0.42 hPa at 25 °C and 3.5 hPa at 50 °C, using the dynamic method.
- Executive summary:
The measurement of the vapor pressure was performed in 2009 using an apparatus manufactured from commercially available equipment. The appearance of the test sample remained unchanged, no discoloration or decomposition was observed. The vapor pressure was determined to be 0.26 hPa at 20°C, 0.42 hPa at 25 °C and 3.5 hPa at 50 °C, using the dynamic method.
Reference
The vapour pressure was measured with the dynamic method in the temperature range of 58°C to 180°C. The measured vapour pressures at the corresponding temperatures are listed in the following table:
Temperature / °C |
Vapor pressure / hPa |
57.7 |
4.5 |
73.4 |
14.9 |
84.2 |
29.8 |
98.2 |
59.9 |
118.1 |
119.6 |
130.7 |
199.5 |
142.4 |
298.5 |
153.2 |
399.8 |
167.7 |
600.0 |
180.4 |
892.0 |
171.9 |
700.3 |
101.8 |
80.0 |
The values for 20, 25 and 50°C are calculated, using the Antoine constants A, B and C as shown. It is likely that the system had not reached its equilibrium at 57.7°C. Therefore this value is not included in the calculation. Due to the prolonged exposure to thermal stress the value at 101.8°C shows a great deviation. Therefore this value is not included in the calculation.
The Antoine constants from the regression of the data from the dynamic method were used to calculate the vapour pressure for 20, 25 and 50°C:
T / °C |
P / hPa |
P / hPa |
20 |
2.6 10-1 |
2.6 101 |
25 |
4.2 x 10-1 |
4.2 x 101 |
50 |
3.5 x 100 |
3.5 x 102 |
Description of key information
Vapor pressure was determined to be 0.26 Pa at 20 °C, applying the dynamic method.
Key value for chemical safety assessment
- Vapour pressure:
- 0.26 hPa
- at the temperature of:
- 20 °C
Additional information
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