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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:
09.09.15 - 10.09.15
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:
no
Type of method:
effusion method: vapour pressure balance
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.002 Pa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.032 Pa

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 in Table 1. The data point measured at 30 °C was not included in the linear regression because it shows an unusual behaviour.

 

Table 1: Measured vapour pressures and corresponding temperatures

Temperature /°C

Vapour pressure / hPa

30

1.4E-4

40

1.5E-4

50

2.3E-4

60

6.0E-4

70

3.1E-3

80

9.0E-3

 

The following vapour pressure values for the test item were extrapolated from the experimental data (see Table 2).

 

Table 2 : Final vapour pressures

T/°C

p/hPa

p/Pa

20

7.7E-6

7.7E-4

25

1.5E-5

1.5E-3

50

3.2E-4

3.2E-2

 

Conclusions:
The vapour pressure of the test item was determined to be 7.7E-4 Pa (20 °C), 1.5E-3 Pa (25 °C) and 3.2E-2 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 at various temperatures between about 30 °C and 80 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:   7.7E-4 Pa (20 °C), 1.5E-3 Pa (25 °C) and 3.2E-2 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 at various temperatures between about 30 °C and 80 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:  7.7E-4 Pa (20 °C), 1.5E-3 Pa (25 °C) and 3.2E-2 Pa (50 °C).

Key value for chemical safety assessment

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

Additional information