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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:
14.07. - 06.12.16
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.006 Pa

The vapour pressure was measured in the temperature range of 70 °C to 120 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1.

 

Table 1: Measured vapour pressures and corresponding temperatures

Temperature /°C

Vapour pressure / hPa

70.3

7.8E-4

80.3

3.0E-3

90.3

9.1E-3

100.3

2.2E-2

110.4

6.9E-4

120.3

3.0E-4

The data points measured at 110 °C and 120 °C were not included in the linear regression. After the measurement the test cell was nearly empty. For this reason it can be assumed that there was not enough test item left to obtain reliable results for the vapour pressure at 110 °C and 120 °C.

For an extrapolation to lower temperatures the Antoine equation was used. This is a conservative estimation of the vapour pressure of the test item for the listed temperatures. In order to further ensure a conservative approach the vapour pressures were rounded up to the next order of magnitude in order to obtain final upper limit values for the vapour pressure.

The pressure values in Table 2 for the test item were extrapolated from the experimental data.

 

Table 2 : Final vapour pressures

T/°C

p/hPa

p/Pa

20

6.9E-7

6.9E-5

25

1.6E-6

1.6E-4

50

6.3E-5

6.3E-3

 

Conclusions:
The vapour pressure of the test item was determined to be 6.9E-5 Pa (20 °C), 1.6E-4 Pa (25 °C) and 6.3E-3 Pa (50 °C).
Executive summary:

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between 70 °C and 120 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 6.9E-5 Pa (20 °C), 1.6E-4 Pa (25 °C) and 6.3E-3 Pa (50 °C).

Description of key information

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between 70 °C and 120 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 6.9E-5 Pa (20 °C), 1.6E-4 Pa (25 °C) and 6.3E-3 Pa (50 °C).

Key value for chemical safety assessment

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

Additional information