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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:
04.-05.09.2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0.002 Pa

The vapour pressure was measured in the temperature range of 30 °C to 80 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1. After the measurement a mass loss of < 1% (w/w) was determined. A molecular mass of 340.25 g/mol ws used for the evaluation.


Table 1: Measured vapour pressures and corresponding temperatures


































Temperature /°C



Vapour pressure  / hPa



30



6.5 x 10-6



40



2.9 x 10-6



50



1.8 x 10-5



60



3.8 x 10-5



70



3.8 x 10-5



80



1.4 x 10-4



The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown in Table 2.


Table 2: Antoine parameters


















A



4.63827



B



-3043.99



C



273.15



 


Table 3 : Final vapour pressures






















T/°C



p/hPa



20



1.8 x 10-6



25



2.7 x 10-6



50



1.7 x 10-5



 

Conclusions:
The vapour pressure of the test item was determined to be 1.8E-4 Pa (20 °C), 2.7E-4 Pa (25 °C) and 1.7E-3 Pa (50 °C).
Executive summary:

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured using the Knudsen cell at various temperatures between about 30 and 80 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 1.8E-4 Pa (20 °C), 2.7E-4 Pa (25 °C) and 1.7E-3 Pa (50 °C).

Description of key information

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured at various temperatures between 30 and 80 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:


1.8E-4 Pa (20 °C), 2.7E-4 Pa (25 °C) and 1.7E-3 Pa (50 °C).

Key value for chemical safety assessment

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

Additional information