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Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

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
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
equivalent or similar to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Principles of method if other than guideline:
For calculation of the vapour pressure a molecular mass range of 140 - 400 g/mol was used.
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.002 Pa
Remarks on result:
other: calculated for a mol weight of 140 g/mol.
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Remarks on result:
other: calculated for a mol weight of 140 g/mol.
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.069 Pa
Remarks on result:
other: calculated for a mol weight of 140 g/mol.
Test no.:
#4
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Remarks on result:
other: calculated for a mol weight of 400 g/mol.
Test no.:
#5
Temp.:
25 °C
Vapour pressure:
0.003 Pa
Remarks on result:
other: calculated for a mol weight of 400 g/mol.
Test no.:
#6
Temp.:
50 °C
Vapour pressure:
0.041 Pa
Remarks on result:
other: calculated for a mol weight of 400 g/mol.

30°C.At the first measurement of experiment 1, all cells were slightly contaminated. Therefore, the cells were meticulously cleaned and weighed. This weight was used as initial weight for the subsequent measurements. To avoid bias, this measurement was not used for calculations.

Conclusions:
For a molecular weight of 140 g/mol, the vapor pressure was determined to be 2.40*10 -3 Pa at 20 °C, 4.40*10 -3 Pa at 25°C and  6.88*10 -2 Pa at 50 °C.
For a molecular weight of 400 g/mol, the vapor pressure was determined to be 1.42*10 -3 Pa at 20 °C, 2.60*10 -3 Pa at 25°C and  4.07*10 -2 Pa at 50 °C.
Executive summary:

The vapour pressure was determined according to OECD 104 (Knudsen cell). Since the substance consists of molecules with different molecular weigth, the vapour pressure was calculated for the lowest and highest molecular weight, i.e., 140 and 400 g/mol.

For a molecular weight of 140 g/mol, the vapor pressure was determined to be 2.40*10 -3 Pa at 20 °C, 4.40*10 -3 Pa at 25°C and  6.88*10 -2 Pa at 50 °C.

For a molecular weight of 400 g/mol, the vapor pressure was determined to be 1.42*10 -3 Pa at 20 °C, 2.60*10 -3 Pa at 25°C and  4.07*10 -2 Pa at 50 °C.

These results gives the upper and lower limit of the vapour pressure for the registered substance.

Description of key information

The vapour pressure was determined according to OECD 104 (Knudsen cell). Since the substance consists of molecules with different molecular weigth, the vapour pressure was calculated for the lowest and highest molecular weight, i.e., 140 and 400 g/mol.

For a molecular weight of 140 g/mol, the vapor pressure was determined to be 2.40*10 -3 Pa at 20 °C, 4.40*10 -3 Pa at 25°C and  6.88*10 -2 Pa at 50 °C.

For a molecular weight of 400 g/mol, the vapor pressure was determined to be 1.42*10 -3 Pa at 20 °C, 2.60*10 -3 Pa at 25°C and  4.07*10 -2 Pa at 50 °C.

These results gives the upper and lower limit of the vapour pressure for the registered substance.

Key value for chemical safety assessment

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

Additional information