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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2021-01-29 to 2021-02-02
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:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
no
Type of method:
dynamic method
Key result
Temp.:
25 °C
Vapour pressure:
< 38.2 hPa
Temp.:
20 °C
Vapour pressure:
< 38.2 hPa

The vapour pressure was measured in the temperature range of 141.1 °C to 149.5 °C. The test item became very viscous during the measurement. Therefore, the measurement had to be aborted after measuring three pressure values.

Measurement No.

Temperature [°C]

Vapour pressure [hPa]

1

141.1

21.1

2

145.1

27.5

3

149.5

38.2

Due to the fact, that the test item became very viscous and the measurement had to be aborted, only three data points could be measured. Additionally, it cannot be excluded, that these values might be already influenced by the changing properties of the test item, because no control measurements with decreasing temperature could be measured. Due to this, the Antoine constants could not be evaluated. Therefore, the vapour pressures were estimated according to the measured vapour pressures.

An evaluable vapour pressure curve could not be measured for the test item, because it became very viscous during the measurement in the temperature range of 141 to 150 °C. Due to this, the vapour pressures for the temperatures 20, 25 and 50 °C are estimated on the basis of the maximum measured vapour pressures to be below 38.2 hPa.

Conclusions:
The vapour pressure of the test item was determined to be below 38.2 hPa at 25 °C.
Executive summary:

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the dynamic method. An evaluable vapour pressure curve could not be measured for the test item, because it became very viscous during the measurement in the temperature range of 141 to 150 °C. Due to this, the vapour pressures for the temperatures 20, 25 and 50 °C are estimated on the basis of the maximum measured vapour pressures to be below 38.2 hPa.

Description of key information

The vapour pressure of the test item was determined to be below 38.2 hPa at 25 °C.

Key value for chemical safety assessment

Additional information

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the dynamic method. An evaluable vapour pressure curve could not be measured for the test item, because it became very viscous during the measurement in the temperature range of 141 to 150 °C. Due to this, the vapour pressures for the temperatures 20, 25 and 50 °C are estimated on the basis of the maximum measured vapour pressures to be below 38.2 hPa.