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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:
02-Oct-2014 to 22-Jul-2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
other: OECD Test Guideline 113 (1981) Thermal Stability
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Test material information:
Composition 1
Key result
Temp.:
20 °C
Vapour pressure:
2.4 Pa
Temp.:
25 °C
Vapour pressure:
3.6 Pa
Temp.:
50 °C
Vapour pressure:
20.8 Pa

Results

The measured vapour pressure values together with the measured temperatures are listed in Table 1.

Table 1: Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

10

1.04

2

15

1.66

3

20

2.38

4

25

4.20

5

30

4.83

 

The measured vapour pressure is slightly outside the measuring range (10-3 to 1 Pa) of the Knudsen cell. Nevertheless, as the vapour pressure value above 1 Pa could be detected properly by the Knudsen cell, this value can be used for the evaluation.

Final Results

The vapour pressure of the test item calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD Test Guideline 104 (2006) is shown in Table 2.

Table 2: Calculated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / Pa

20

2.4

25

3.6

50

20.8

 

 

Conclusions:
Vapour pressure values of 2.4 Pa (at 20 °C), 3.6 Pa (at 25 °C) and 20.8 Pa (at 50 °C) were determined for the test substance according to EU Method A.4.

Description of key information

Vapour pressure: 2.4 Pa at 20 °C (EU Method A.4, vapour pressure curve).

Key value for chemical safety assessment

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

Additional information

Vapour pressure values of 2.4 Pa (at 20 °C), 3.6 Pa (at 25 °C) and 20.8 Pa (at 50 °C) were determined for the test substance according to EU Method A.4.