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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:
29.-30.08.2017
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
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 95 °C to 110 °C. After the measurement a mass loss of approx. 93 % (w/w) was determined.

Table 1: Measured vapour pressures and corresponding temperatures

Temperature / °C

Vapour pressure / hPa

95

8.3 x 10-4

100

1.4 x 10-3

105

2.4 x 10-3

110

3.8 x 10-3

115

6.0 x 10-3

120

9.3 x 10-3

110

3.2 x 10-3

 

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown in Table 2.

Table 2: Antoine parameters and extrapolated vapour pressures

T / °C

p / hPa

log (p/hPa) = A + B/(C+T[°C])

20

5.2 x 10-8

A = 13.30106

25

1.2 x 10-7

B = -6033.75

50

4.3 x 10-6

C = 273.15
Conclusions:
The vapour pressure of the test substance was 0.000012 Pa at 25 °C, 0.0000052 Pa at 20 °C and 0.00043 Pa at 50 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item using the effusion method vapour pressure balance. The vapour pressure of the test item was determined at temperatures between 95 and 110 °C. After the measurement a mass loss of approx. 93 % (w/w) was determined. Using the Antoine equation, the constants A and B were determined and the vapour pressure of the test item at 20, 25 and 50 °C was extrapolated from the experimental vapour pressure. The vapour pressure was calculated to be 0.000012 Pa at 25 °C, 0.0000052 Pa at 20 °C and 0.00043 Pa at 50 °C, respectively.

Description of key information

The vapour pressure of the test substance was 0.000012 Pa at 25 °C, 0.0000052 Pa at 20 °C and 0.00043 Pa at 50 °C, respectively (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 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item using the effusion method vapour pressure balance. The vapour pressure of the test item was determined at temperatures between 95 and 110 °C. After the measurement a mass loss of approx. 93 % (w/w) was determined. Using the Antoine equation, the constants A and B were determined and the vapour pressure of the test item at 20, 25 and 50 °C was extrapolated from the experimental vapour pressure. The vapour pressure was calculated to be 0.000012 Pa at 25 °C, 0.0000052 Pa at 20 °C and 0.00043 Pa at 50 °C, respectively (reference 4.6-1).