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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:
2003-04-29
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0 hPa
Temp.:
50 °C
Vapour pressure:
0 hPa

The vapour pressure was measured in the temperature range of 32 °C to 126 °C. No signal was observed up to a of temperature of 66 °C, meaning that the vapour pressure in this range was below the lower detection limit of 10-5 hPa. The vapour pressure was measured at the following temperatures: 32.1, 41.1, 45.5, 45.9, 51.5, 57.3, 65.7 and 66.0. For every temperature the vapour pressure of the test item was <10-5  hPa. Above 72 °C a vapour pressure could be measured.






















































Temperature / °C



Vapour pressure / hPa



72.5



2.1 x 10-5



72.8



2.1 x 10-5



80.0



4.3 x 10-5



85.0



9.8 x 10-5



90.0



1.9 x 10-4



95.7



3.5 x 10-4



101.6



6.5 x 10-4



107.4



1.4 x 10-3



115.6



3.4 x 10-3



123.2



7.2 x 10-3



127.8



1.3 x 10-3



 


log (p/hPa) = A + B/(C+T[°C])


A = 15.59411, B = -7022.44, C =273.15

Conclusions:
The vapour pressure of the test item was found to be 1.1 x 10-8 hPa at 25 °C.
Executive summary:

The vapour pressure of the test item was determined using the Effusion method: Vapour pressure balance according to OECD Test Guideline 104 and EU method, A.4. The vapour pressure was determined in the temperature range of 32 °C to 126 °C. The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was determined by linear regression of the measured values. The vapour pressure of the test item was found to be 4.4 × 10-9, 1.1 x 10-8  and 7.3 × 10-7 hPa at 20, 25 and 50 °C.

Description of key information

The vapour pressure of the test item was found to be 1.1 x 10-8 hPa at 25 °C (reference 4.6-1).

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined using the Effusion method: Vapour pressure balance according to OECD Test Guideline 104 and EU method, A.4. The vapour pressure was determined in the temperature range of 32 °C to 126 °C. The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was determined by linear regression of the measured values. The vapour pressure of the test item was found to be 4.4 × 10-9, 1.1 x 10-8  and 7.3 × 10-7 hPa at 20, 25 and 50 °C.