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EC number: 218-964-8 | CAS number: 2304-30-5
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:
- 2014
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: In accordance with test guidelines EC A.4 and OECD 104 but with a deviation.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- (2006)
- Deviations:
- yes
- Remarks:
- An Aluminium pan has been used instead of a roughened glassplate.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- yes
- Remarks:
- see above
- GLP compliance:
- no
- Type of method:
- other: Effusion method: isothermal thermogravimetry
- Temp.:
- 25 °C
- Vapour pressure:
- 0.018 Pa
- Conclusions:
- Using the isothermal thermogravimetric effusion method, the vapour pressure of the substance at 25°C has been determined as 0.018 Pa.
Reference
Table: Experimental evaporation rates of test substance with calculated vapour pressure.
Temp. (°C) |
Evaporation Rate (µg/min) |
log Evaporation Rate (µg/min) |
Temp. (1/K) |
Log Vapour Pressure (mmHg) |
Calculated Vapour Pressure (mm Hg) |
Calculated Vapour Pressure (Pascal) |
50 |
0.02374 |
-1.6245 |
0.00309 |
-3.3295 |
0.00046826 |
0.062429 |
60 |
0.03488 |
-1.4574 |
0.00300 |
-3.1573 |
0.00069621 |
0.092821 |
65 |
0.04315 |
-1.3650 |
0.00296 |
-3.0620 |
0.00086697 |
0.11559 |
70 |
0.05094 |
-1.2929 |
0.00291 |
-2.9877 |
0.0010287 |
0.13715 |
80 |
0.08012 |
-1.0963 |
0.00283 |
-2.7849 |
0.0016408 |
0.21876 |
The isotherms at 65°C is shown in the picture below along with the heat profile and slope at constant rate of weight loss (over 300 minutes).
Description of key information
Vapour pressure at 25°C: 0.018 Pa (EC A.4 and OECD 104: isothermal thermogravimetric effusion method)
Key value for chemical safety assessment
- Vapour pressure:
- 0.018 Pa
- at the temperature of:
- 25 °C
Additional information
Deviation from the test guidelines: an Aluminium pan has been used instead of a roughened glassplate.
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