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EC number: 214-202-3 | CAS number: 1113-38-8
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:
- 27 Nov - 29 Nov 2015
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- no
- Type of method:
- effusion method: Knudsen cell
- Temp.:
- 20 °C
- Vapour pressure:
- 0 hPa
- Remarks on result:
- other:
- Remarks:
- Fitted values. Fitting based on Antoine equation logP=A+B/(C+T)
- Temp.:
- 25 °C
- Vapour pressure:
- 0 hPa
- Remarks on result:
- other:
- Remarks:
- Fitted value. Fitting based on Antoine equation logP=A+B/(C+T)
- Temp.:
- 50 °C
- Vapour pressure:
- 0 hPa
- Remarks on result:
- other:
- Remarks:
- Fitted value. Fitting based on Antoine equation logP=A+B/(C+T)
Reference
Results
Vapour pressure was measured in the temperature ranges of 40 to 100 °C.
Table 1 – Meaured vapour pressure and corresponding temperatures
Temperature [°C] |
Vapour pressure [hPa] |
40 |
1.4E-03 |
50 |
4.4E-05 |
60 |
1.7E-04 |
70 |
4.8E-04 |
80 |
1.2E-03 |
85 |
1.7E-03 |
90 |
2.2E-03 |
95 |
2.3E-03 |
100 |
2.3E-03 |
The data point measured at 40 °C was not included in the linear regression because it shows a typical deviation caused by volatile impurities (e.g. humidity at the beginning of the measurement). Data points measured from 85 to 100 °C were also not included because they show a deviation, which was attributed to the start of decomposition (see also 4.2 -1 and 4.2 -2).
The values for 20, 25 and 50 °C were calculated using the Antoine constants A,B and C as shown in Table 2.
Table 2 – Antoine parameters and extrapolated vapour pressures
T [°C] |
p [hPa] |
p [Pa] |
log p = A + B/(C+T) |
20 |
9.5E-07 |
9.5E-05 |
A = 12.39139 |
25 |
1.9E-06 |
1.9E-04 |
B = -5398.53 |
50 |
4.9E-05 |
4.9E-03 |
C = 273.15 |
Description of key information
9.5E-07 hPa at 20 °C
1.9E-06 hPa at 25 °C
4.9E-05 hPa at 50 °C
(OECD 104, vapour pressure curve)
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
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