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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:
11.07. - 12.07.19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
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

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 below:

 

Temperature / °C

Vapour pressure / hPa

51

6.4 x 10E-6

60

not evaluable

70

not evaluable

80

not evaluable

90

not evaluable

 100  not evaluable
 110  not evaluable

 

Since the test did not yield vapour pressures sufficiently high to extrapolate to 20, 25 and 50'C these values were estimated.

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C.

 

The following vapour pressure values for the test item were extrapolated from the experimental data:

 

20 °C: 9.9x10E-8 Pa

25 °C: 1.9x10E-7 Pa

50 °C: 3.8x10E-6 Pa

 

Conclusions:
The vapour pressure of the test item at 25 °C was determined to be 1.9x10E-7 Pa.
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 in the temperature range 51 -110 °C. All measured vapour pressures were below the detection limit of 1 x 10-5 hPa. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C. The vapour pressure was calculated to be 9.9 x 10E-8 Pa at 20 °C and 1.9 x 10E-7 Pa at 25 °C and 3.8 x 10E-6 Pa at 50 °C respectively.

Description of key information

The vapour pressure of the test item at 25 °C was determined to be 1.9x10E-9 hPa (reference 4.6 -1).

Key value for chemical safety assessment

Vapour pressure:
0 hPa
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 in the temperature range 51 -110 °C.All measured vapour pressures were below the detection limit of 1 x 10-5 hPa. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C. The vapour pressure was calculated to be 9.9 x 10E-8 Pa at 20 °C and 1.9 x 10E-7 Pa at 25 °C and 3.8 x 10E-6 Pa at 50 °C respectively.