Registration Dossier
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EC number: 243-818-5 | CAS number: 20429-33-8
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:
- From June 12, 2017 to September 20, 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- < 0.002 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- < 0.005 Pa
- Conclusions:
- Under the study conditions, from the measured weight losses in the temperature range 100 -130°C, the vapour pressure of the test substance was determined to be lower than the vapour pressure of reference substance hexachlorobenzene. The vapour pressure of the test substance at 20°C and 25°C was therefore concluded to be < 1.5E-3 Pa and < 4.8E-3 Pa, respectively (Reingruber, 2017).
- Executive summary:
A study was conducted to determine the vapour pressure of the test substance according to OECD Guideline 104, EU Method A.4 and OPPTS 830.7950. The vapour pressure of the test substance was determined using the isothermal thermogravimetric effusion method. Under the study conditions, from the measured weight losses in the temperature range 100 -130°C, the vapour pressure of the test substance was determined to be lower than the vapour pressure of reference substance hexachlorobenzene. The vapour pressure of the test substance at 20°C and 25°C was therefore concluded to be < 1.5E-3 Pa and < 4.8E-3 Pa, respectively (Reingruber, 2017).
Reference
The weight of the test substance did not decrease constantly with time during the isothermal steps throughout the investigated temperature range. This might have been caused by the presence of minor components with higher volatility or (partial) reaction and/or decomposition of the test substance during testing. A log p versus 1/T curve for the test substance yielded a curve with a coefficient of correlation (r) of < 0.99. Extrapolation of the curve to 20°C or 25°C would not give reliable results for the vapour pressure of the substance at these temperatures.
Since the weight losses of the test substance at 100°C, 110°C, 120°C and 130°C were lower than the weight losses of reference substance hexachlorobenzene at the same temperatures, it was concluded that vapour pressure of the substance at 20°C (25°C) is lower than the vapour pressure of hexachlorobenzene at 20°C (25°C).
Description of key information
The vapour pressure was determined according to OECD Guideline 104, EU Method A.4 and OPPTS 830.7950 (Reingruber, 2017).
Key value for chemical safety assessment
- Vapour pressure:
- 0.002 Pa
- at the temperature of:
- 20 °C
Additional information
< 1.5E-3 Pa. (20°C)
< 4.8E-3 Pa. (25°C)
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