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Physical & Chemical properties

Vapour pressure

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Administrative data

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From July 12, 2016 to July 16, 2016
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:
not specified
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: estimated with the Antoine equation
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa
Remarks on result:
other: estimated with the Antoine equation
Key result
Temp.:
50 °C
Vapour pressure:
< 0.001 Pa
Remarks on result:
other: estimated with the Antoine equation

The vapour pressure was measured in the temperature range of 30°C to 100°C. Since the test did not yield vapour pressures sufficiently high to extrapolate to 20, 25 and 50°C, these values were estimated. According to the Antoine equation, the vapour pressure can be calculated according to: p = Vapour pressure in hPa; T = Temperature in °C and A, B, C = Antoine constants. For an extrapolation to lower temperatures a conservative assumption of the Antoine constant C is 273.15. This results in a linear dependency of log(p) of the inverse Temperature 1/T (in K). Values for the resulting slope of the Antoine equation (constant B) for substances of high molecular weight, which can be derived from literature values are lower than -5000. Thus, for a conservative estimation of the vapour pressure of the test substance at 20, 25 and 50°C, a value of -5000 for constant B and a value of 273.15 for constant C, respectively, were used. Nearly all measurement points starting at 60°C showed an unusual behaviour; all were around 1.0E-05 hPa. The data point of the measurement at 60°C (1.0E-05) was therefore used as the starting point for calculations.

Conclusions:
Under the study conditions, the estimated vapour pressure of the test substance was determined to be <1.0E-05 and <1.0E-03 Pa at 20.0 and 50.0°C, respectively.

Executive summary:

A study was conducted to determine the vapour pressure of the test substance, according to OECD Guideline 104 and EU Method A.4. The effusion method: vapour pressure balance was used to assess this parameter. The vapour pressure was measured in the temperature range of 30°C to 100°C. Since the test did not yield vapour pressures sufficiently high to extrapolate to 20, 25 and 50°C, these values were estimated. According to the Antoine equation, the vapour pressure can be calculated according to: p = Vapour pressure in hPa; T = Temperature in °C and A, B, C = Antoine constants. For an extrapolation to lower temperatures a conservative assumption of the Antoine constant C is 273.15. This results in a linear dependency of log(p) of the inverse Temperature 1/T (in K). Values for the resulting slope of the Antoine equation (constant B) for substances of high molecular weight, which can be derived from literature values are lower than -5000. Thus, for a conservative estimation of the vapour pressure of the test substance at 20, 25 and 50 °C, a value of -5000 for constant B and a value of 273.15 for constant C, respectively, were used. Nearly all measurement points starting at 60°C showed an unusual behaviour; all were around 1.0E-05 hPa. The data point of the measurement at 60°C (1.0E-05) was therefore used as the starting point for calculations. Under the study conditions, the estimated vapour pressure of the test substance was determined to be <1.0E-05 and <1.0E-03 Pa at 20.0 and 50.0°C, respectively (Dornhagen, 2016).

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (effusion method) (Dornhagen, 2016).

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information

The vapour pressure were <1.0E-05 and <1.0E-03 Pa at 20.0 and 50.0°C, respectively.