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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:
from 2008-04-22 to 2008-05-28
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:
2006-03-23
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
92/69/EU
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 hPa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 hPa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 hPa

Vapour Pressure Balance (Effusion Method):

The vapour pressure was measured in the temperature range of 25°C to 145°C. Above 80°C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures as follows:

1) 1.0 x 10-5 hPa at 79.8°C

2) 1.7 x 10-5 hPa at 86.7°C

3) 2.8 x 10-5 hPa at 89.5°C

4) 3.2 x 10-5 hPa at 91.3°C

5) 6.0 x 10-5 hPa at 97.6°C

6) 1.2 x 10-4 hPa at 104.2°C

7) 2.3 x 10-4 hPa at 109.8°C

8) 4.8 x 10-3 hPa at 116.7°C

9) 9.6 x 10-4 hPa at 125.5°C

10) 1.9 x 10-3 hPa at 132.1°C

11) 3.9 x 10-3 hPa at 140.0°C

12) 6.3 x 10-3 hPa at 145.3°C

Only for better readability the temperature is reported in a centigrade scale. The values for 20, 25 and 50°C are calculated, using the Antoine constants A, B and C.

Results:

The calculated vapour pressure values are extrapolated:

1) 1.7 x 10-9 hPa at 20°C

2) 4.0 x 10-9 hPa at 25°C

3) 1.8 x 10-7 hPa at 50°C

Conclusions:
The vapour pressure of the test item was determined to be 1.7 x 10E-9 hPa at 20 °C, 4.0 x 10E-9 hPa at 25 °C, 1.8 x E-7 hPa at 50 °C.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined between 25 to 145 °C using the effusion method (weight loss). Above 80°C a vapour pressure could be measured. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test item was determined to be 1.7 x 10E-9 hPa at 20 °C, 4.0 x 10E-9 hPa at 25 °C, 1.8 x E-7 hPa at 50 °C.

Description of key information

The determined vapour pressure values are 1.7 x 10E-9 hPa at 20 °C, 4.0 x 10E-9 hPa at 25 °C, 1.8 x E-7 hPa at 50 °C.

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, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined between 25 to 145 °C using the effusion method (weight loss). Above 80°C a vapour pressure could be measured. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test item was determined to be 1.7 x 10E-9 hPa at 20 °C, 4.0 x 10E-9 hPa at 25 °C, 1.8 x E-7 hPa at 50 °C.