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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:
2018-11-19 to 2018-11-20
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: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 60 °C to 120 °C. After the measurement a mass loss of approx. 64 % (w/w) was determined.

Table 1: Measured vapour pressures and corresponding temperatures

Temperature / °C

Vapour pressure / hPa

60

2.8 x 10E-5

80

8.4 x 10E-5

90

2.9 x 10E-4

100

9.1 x 10E-4

110

2.7 x 10E-3

120

7.5 x 10E-3

100*

9.4 x 10E-4

 *measurement point during cooling down

The data point measured at 60 °C was not included in the linear regression because it showed a typical deviation caused by volatile impurities at the beginning of a measurement. From the measured data the parameters A, B and C of the Antoine equation was derived by regression to be A=15.1199, B -6780.43, C=273.15.

Conclusions:
The vapour pressure of the test item at 25 °C was determined to be 2.4E-6 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 60 -120 °C. 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 9.8E-7 Pa at 20 °C and 2.4E-6 Pa at 25 °C and 1.4E-4 Pa at 50 °C respectively.

Description of key information

The vapour pressure of the test item at 25 °C was determined to be 2.4E-6 Pa (reference 4.6-1).

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 in the temperature range 60 -120 °C. 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 were calculated, using the Antoine constants A, B and C. The vapour pressure was calculated to be 9.8E-7 Pa at 20 °C and 2.4E-6 Pa at 25 °C and 1.4E-4 Pa at 50 °C respectively.