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EC number: 701-359-2 | CAS number: -
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:
- From December 10, 2011 to March 28, 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
- Specific details on test material used for the study:
- Batch: HTIF11021
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- < 0 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- < 0 Pa
- Conclusions:
- Under the study conditions, the vapour pressure of the test substance was < 1.3E-08 Pa at 20°C and < 6.5E-08 Pa at 25°C.
- Executive summary:
A study was conducted to determine the vapour pressure of the test substance according to EU Method A.4 (Vapour pressure) and OECD guideline 104 (Vapour pressure curve). The vapour pressure of the test substance (PT) was determined by the isothermal thermogravimetric effusion method. The method is validated in the range 10E-08 - 10E03 Pa using a set of five reference substances with known vapour pressures. The validity of the method was verified maximum one month before this study using hexachlorobenzene (>99%, Fluka Chemie, Buchs, Switzerland) as reference control substance. The logarithm of the evaporation rate at 20°C (log vT, 20) deviated < 10% from the average value obtained during the validation test. From this, it was possible to apply the constants obtained with the validation test for the determination of the vapour pressure of the test substance. Under the study conditions, the vapour pressure of the test substance was < 1.3E-08 Pa at 20°C and < 6.5E-08 Pa at 25°C (Oudhoff, 2012).
Reference
The vapour pressure is a function of the temperature and is specified in Pascal (Pa) or in mm Hg.
Equations:
-Evaporation rate (νT) = delta m/F*t (g/cm2/h) (where: delta m = weight loss of the test substance, F = surface of the sample late, and t = elapsed time for the weight loss).
-Vapour pressure equation (logPT) = c logvT + d (where: c and d = constants specific for the experiment arrangement).
-Vapour pressure regression curve (PT) = a 1/T + b (where T = temperature (K), a = slope (K), and b = intercept).
Results:
The weight loss of the test substance at 210°C, 220°C, 230°C and 240°C was lower than the weight loss of benzo(ghi)perylene at the same temperatures.
Vapour pressure values:
| 20°C | 20°C | 25°C | 25°C | |
| Pa | mm Hg | Pa | mmHg | |
| Test substance | <1.3E-08 | <1.0E-10 | <6.5E-08 | <4.8E-10 |
Description of key information
The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Oudhoff, 2012).
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the substance was < 1.3E-08 Pa at 20°C and < 6.5E-08 Pa at 25°C
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