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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
January 22, 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Temp.:
ca. 20 °C
Vapour pressure:
ca. 0 Pa
Key result
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0 Pa

The vapour pressure was calculated initially for three measurement points as below:

No.

temperature [0C]

vapour pressure [Pa]

1

90.1

0.56

2

107.2

3.51

3

125.2

18.60

The log(p) = a.1/T+b graph is shown in the attached background material section.

Conclusions:
The vapour pressure was determined to be 4.16 x 10-5 Pa at 20°C and 9.52 x 10-5 Pa at 25°C.
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 method is based on the determination of the mass of test substance flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour can be obtained by determining the loss of mass. Based on the results, the vapour pressure of the test substance was determined to be 4.16 x 10-5 Pa at 20°C and 9.52 x 10-5 Pa at 25°C (Petryka, 2010).

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Petryka, 2010).

Key value for chemical safety assessment

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

Additional information