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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Temp.:
20 °C
Vapour pressure:
0.17 Pa
Temp.:
25 °C
Vapour pressure:
0.32 Pa

From the measured data the parametersof the Antoine equation can be derived by regression.

Measured vapour pressures and corresponding temperatures:

 Temperature / °C  Vapour pressure / hPa
 10  5.2 x 10E-4
 15  8.5 x 10E-4
 20  1.7 x 10E-3
 25  3.2 x 10E-3
 30  6.0 x 10E-3
 35  1.1 x 10E-2
 40  1.8 x 10E-2
 45  2.8 x 10E-2
Conclusions:
The vapour pressure of Ditolyl ether at 20 and 25 °C was determined as 0.17 Pa and 0.32 Pa, respectively.
Executive summary:

The purpose of this study was the determination of the vapour pressure of the test item according to European Commission Regulations (EC) No. 440/2008 and No. 761/2009, A.4. Vapour pressure: effusion method and OECD test guideline, OECD 104 (2006) Vapour pressure.

The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The test item is filled into the test cell and placed in a furnace in the vacuum chamber from which the sample evaporates. The temperature of the cell with the test item is controlled by a surrounding heater. The vapour forms a molecular jet of defined geometry limited by an orifice. The mass of effused vapour is obtained by determining the loss of mass in the cell.

The vapour pressure of Ditolyl ether at 20 and 25 °C was determined as 0.17 Pa and 0.32 Pa, respectively.

Description of key information

The purpose of this study was the determination of the vapour pressure of the test item according to European Commission Regulations (EC) No. 440/2008 and No. 761/2009, A.4. Vapour pressure: effusion method and OECD test guideline, OECD 104 (2006) Vapour pressure.

The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The test item is filled into the test cell and placed in a furnace in the vacuum chamber from which the sample evaporates. The temperature of the cell with the test item is controlled by a surrounding heater. The vapour forms a molecular jet of defined geometry limited by an orifice. The mass of effused vapour is obtained by determining the loss of mass in the cell.

The vapour pressure of Ditolyl ether at 20 °C and 25 °C was determined as 0.17 Pa and 0.32 Pa, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.17 Pa
at the temperature of:
20 °C

Additional information