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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:
30.10. - 17.11.2006
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
1992
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 25 °C to 127 °C. Above 73 °C a vapour pressure could be measured.


Table 1: Measured vapour pressures and corresponding temperatures


















































Temperature / °C



Vapour pressure / hPa



73.2



1.2 x 10-5



77.7



1.6 x 10-5



82.6



3.3 x 10-5



88.4



5.8 x 10-5



95.2



1.0 x 10-4



101.3



1.6 x 10-4



108.0



2.7 x 10-4



115.6



5.1 x 10-4



122.1



8.7 x 10-4



127.4



1.3 x 10-3



 


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 and extrapolated vapour pressures


























T/°C



p/hPa



log (p/hPa) = A + B/(C+T[°C])



20



2.35E-08



A= 10.06218



25



4.66E-08



B= -5185.99



50



1.03E-06



C= 273.15


Conclusions:
The vapour pressure of the test substance was 0.0000047 Pa at 25 °C, 0.0000024 Pa at 20 °C and 0.00010 Pa at 50 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 92/69/EEC method A.4 to determine the vapour pressure of the test item using the effusion method: vapour pressure balance. The vapour pressure of the test item was determined at temperatures between 25 °C and 127 °C. Using the Antoine equation, the constants A, B and C were determined and the vapour pressure of the test item at 20, 25 and 50 °C was extrapolated from the experimental vapour pressure. The vapour pressure was calculated to be 0.0000024 Pa at 20 °C, 0.0000047 Pa at 25 °C and 0.00010 Pa at 50 °C, respectively.

Description of key information

The vapour pressure of the test substance was 0.0000047 Pa at 25 °C, 0.0000024 Pa at 20 °C and 0.00010 Pa at 50 °C, respectively.

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104 and Regulation (EC) No 92/69/EEC method A.4 to determine the vapour pressure of the test item using the effusion method: vapour pressure balance. The vapour pressure of the test item was determined at temperatures between 25 °C and 127 °C. Using the Antoine equation, the constants A, B and C were determined and the vapour pressure of the test item at 20, 25 and 50 °C was extrapolated from the experimental vapour pressure. The vapour pressure was calculated to be 0.0000024 Pa at 20 °C, 0.0000047 Pa at 25 °C and 0.00010 Pa at 50 °C, respectively (reference 4.6-1).